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gnu-social/extlib/Date/Calc.php
Diogo Cordeiro a38f25f7cd [PEAR] Modernize Validate code 
Upgraded IDNA to IDNA2
Added PEAR Date
> fixed: The each function is deprecated
2019-08-03 17:31:43 +01:00

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: */
// {{{ Header
/**
* Calculates, manipulates and retrieves dates
*
* It does not rely on 32-bit system time stamps, so it works dates
* before 1970 and after 2038.
*
* PHP versions 4 and 5
*
* LICENSE:
*
* Copyright (c) 1999-2007 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor,
* C.A. Woodcock
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted under the terms of the BSD License.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @category Date and Time
* @package Date
* @author Monte Ohrt <monte@ispi.net>
* @author Pierre-Alain Joye <pajoye@php.net>
* @author Daniel Convissor <danielc@php.net>
* @author C.A. Woodcock <c01234@netcomuk.co.uk>
* @copyright 1999-2007 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor, C.A. Woodcock
* @license http://www.opensource.org/licenses/bsd-license.php
* BSD License
* @version CVS: $Id$
* @link http://pear.php.net/package/Date
* @since File available since Release 1.2
*/
// }}}
/**
* PEAR
*/
require_once 'PEAR.php';
// {{{ General constants:
if (!defined('DATE_CALC_BEGIN_WEEKDAY')) {
/**
* Defines what day starts the week
*
* Monday (1) is the international standard.
* Redefine this to 0 if you want weeks to begin on Sunday.
*/
define('DATE_CALC_BEGIN_WEEKDAY', 1);
}
if (!defined('DATE_CALC_FORMAT')) {
/**
* The default value for each method's $format parameter
*
* The default is '%Y%m%d'. To override this default, define
* this constant before including Calc.php.
*
* @since Constant available since Release 1.4.4
*/
define('DATE_CALC_FORMAT', '%Y%m%d');
}
// {{{ Date precision constants (used in 'round()' and 'trunc()'):
define('DATE_PRECISION_YEAR', -2);
define('DATE_PRECISION_MONTH', -1);
define('DATE_PRECISION_DAY', 0);
define('DATE_PRECISION_HOUR', 1);
define('DATE_PRECISION_10MINUTES', 2);
define('DATE_PRECISION_MINUTE', 3);
define('DATE_PRECISION_10SECONDS', 4);
define('DATE_PRECISION_SECOND', 5);
// }}}
// {{{ Class: Date_Calc
/**
* Calculates, manipulates and retrieves dates
*
* It does not rely on 32-bit system time stamps, so it works dates
* before 1970 and after 2038.
*
* @category Date and Time
* @package Date
* @author Monte Ohrt <monte@ispi.net>
* @author Daniel Convissor <danielc@php.net>
* @author C.A. Woodcock <c01234@netcomuk.co.uk>
* @copyright 1999-2007 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor, C.A. Woodcock
* @license http://www.opensource.org/licenses/bsd-license.php
* BSD License
* @version Release: 1.5.0a1
* @link http://pear.php.net/package/Date
* @since Class available since Release 1.2
*/
class Date_Calc
{
// {{{ dateFormat()
/**
* Formats the date in the given format, much like
* {@link http://www.php.net/strftime strftime()}
*
* This function is used to alleviate the problem with 32-bit numbers for
* dates pre 1970 or post 2038, as strftime() has on most systems.
* Most of the formatting options are compatible.
*
* Formatting options:
*
* - <b>%a</b> - abbreviated weekday name (Sun, Mon, Tue)
* - <b>%A</b> - full weekday name (Sunday, Monday, Tuesday)
* - <b>%b</b> - abbreviated month name (Jan, Feb, Mar)
* - <b>%B</b> - full month name (January, February, March)
* - <b>%d</b> - day of month (range 00 to 31)
* - <b>%e</b> - day of month, single digit (range 0 to 31)
* - <b>%E</b> - number of days since unspecified epoch (integer).
* ('<b>%E</b>' is useful for passing a date in a URL as an
* integer value. Then simply use {@link Date_Calc::daysToDate()}
* to convert back to a date.)
* - <b>%j</b> - day of year (range 001 to 366)
* - <b>%m</b> - month as decimal number (range 1 to 12)
* - <b>%n</b> - newline character (\n)
* - <b>%t</b> - tab character (\t)
* - <b>%w</b> - weekday as decimal (0 = Sunday)
* - <b>%U</b> - week number of current year, first sunday as first week
* - <b>%y</b> - year as decimal (range 00 to 99)
* - <b>%Y</b> - year as decimal including century (range 0000 to 9999)
* - <b>%%</b> - literal '%'
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* @param string $format the format string
*
* @return string the date in the desired format
* @access public
* @static
*/
public function dateFormat($day, $month, $year, $format)
{
if (!Date_Calc::isValidDate($day, $month, $year)) {
$year = Date_Calc::dateNow('%Y');
$month = Date_Calc::dateNow('%m');
$day = Date_Calc::dateNow('%d');
}
$output = '';
for ($strpos = 0; $strpos < strlen($format); $strpos++) {
$char = substr($format, $strpos, 1);
if ($char == '%') {
$nextchar = substr($format, $strpos + 1, 1);
switch ($nextchar) {
case 'a':
$output .= Date_Calc::getWeekdayAbbrname($day, $month, $year);
break;
case 'A':
$output .= Date_Calc::getWeekdayFullname($day, $month, $year);
break;
case 'b':
$output .= Date_Calc::getMonthAbbrname($month);
break;
case 'B':
$output .= Date_Calc::getMonthFullname($month);
break;
case 'd':
$output .= sprintf('%02d', $day);
break;
case 'e':
$output .= $day;
break;
case 'E':
$output .= Date_Calc::dateToDays($day, $month, $year);
break;
case 'j':
$output .= Date_Calc::dayOfYear($day, $month, $year);
break;
case 'm':
$output .= sprintf('%02d', $month);
break;
case 'n':
$output .= "\n";
break;
case 't':
$output .= "\t";
break;
case 'w':
$output .= Date_Calc::dayOfWeek($day, $month, $year);
break;
case 'U':
$output .= Date_Calc::weekOfYear($day, $month, $year);
break;
case 'y':
$output .= sprintf(
'%0' .
($year < 0 ? '3' : '2') .
'd',
$year % 100
);
break;
case "Y":
$output .= sprintf(
'%0' .
($year < 0 ? '5' : '4') .
'd',
$year
);
break;
case '%':
$output .= '%';
break;
default:
$output .= $char . $nextchar;
}
$strpos++;
} else {
$output .= $char;
}
}
return $output;
}
// }}}
// {{{ dateNow()
/**
* Returns the current local date
*
* NOTE: This function retrieves the local date using
* {@link http://www.php.net/strftime strftime()}, which may or may
* not be 32-bit safe on your system.
*
* @param string $format the string indicating how to format the output
*
* @return string the current date in the specified format
* @access public
* @static
*/
public function dateNow($format = DATE_CALC_FORMAT)
{
return strftime($format, time());
}
// }}}
// {{{ getYear()
/**
* Returns the current local year in format CCYY
*
* @return string the current year in four digit format
* @access public
* @static
*/
public function getYear()
{
return Date_Calc::dateNow('%Y');
}
// }}}
// {{{ getMonth()
/**
* Returns the current local month in format MM
*
* @return string the current month in two digit format
* @access public
* @static
*/
public function getMonth()
{
return Date_Calc::dateNow('%m');
}
// }}}
// {{{ getDay()
/**
* Returns the current local day in format DD
*
* @return string the current day of the month in two digit format
* @access public
* @static
*/
public function getDay()
{
return Date_Calc::dateNow('%d');
}
// }}}
// {{{ defaultCentury()
/**
* Turns a two digit year into a four digit year
*
* Return value depends on current year; the century chosen
* will be the one which forms the year that is closest
* to the current year. If the two possibilities are
* equidistant to the current year (i.e. 50 years in the past
* and 50 years in the future), then the past year is chosen.
*
* For example, if the current year is 2007:
* - <b>"03"</b> - returns 2003
* - <b>"09"</b> - returns 2009
* - <b>"56"</b> - returns 2056 (closer to 2007 than 1956)
* - <b>"57"</b> - returns 1957 (1957 and 2007 are equidistant,
* so previous century chosen)
* - <b>"58"</b> - returns 1958
*
* @param int $year the 2 digit year
*
* @return int the 4 digit year
* @access public
* @static
*/
public function defaultCentury($year)
{
$hn_century = intval(($hn_currentyear = date("Y")) / 100);
$hn_currentyear = $hn_currentyear % 100;
if ($year < 0 || $year >= 100) {
$year = $year % 100;
}
if ($year - $hn_currentyear < -50) {
return ($hn_century + 1) * 100 + $year;
} elseif ($year - $hn_currentyear < 50) {
return $hn_century * 100 + $year;
} else {
return ($hn_century - 1) * 100 + $year;
}
}
// }}}
// {{{ getSecondsInYear()
/**
* Returns the total number of seconds in the given year
*
* This takes into account leap seconds.
*
* @param int $pn_year the year in four digit format
*
* @return int
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getSecondsInYear($pn_year)
{
$pn_year = intval($pn_year);
static $ha_leapseconds;
if (!isset($ha_leapseconds)) {
$ha_leapseconds = array(1972 => 2,
1973 => 1,
1974 => 1,
1975 => 1,
1976 => 1,
1977 => 1,
1978 => 1,
1979 => 1,
1981 => 1,
1982 => 1,
1983 => 1,
1985 => 1,
1987 => 1,
1989 => 1,
1990 => 1,
1992 => 1,
1993 => 1,
1994 => 1,
1995 => 1,
1997 => 1,
1998 => 1,
2005 => 1);
}
$ret = Date_Calc::daysInYear($pn_year) * 86400;
if (isset($ha_leapseconds[$pn_year])) {
return $ret + $ha_leapseconds[$pn_year];
} else {
return $ret;
}
}
// }}}
// {{{ getSecondsInMonth()
/**
* Returns the total number of seconds in the given month
*
* This takes into account leap seconds.
*
* @param int $pn_month the month
* @param int $pn_year the year in four digit format
*
* @return int
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getSecondsInMonth($pn_month, $pn_year)
{
$pn_month = intval($pn_month);
$pn_year = intval($pn_year);
static $ha_leapseconds;
if (!isset($ha_leapseconds)) {
$ha_leapseconds = array(1972 => array(6 => 1,
12 => 1),
1973 => array(12 => 1),
1974 => array(12 => 1),
1975 => array(12 => 1),
1976 => array(12 => 1),
1977 => array(12 => 1),
1978 => array(12 => 1),
1979 => array(12 => 1),
1981 => array(6 => 1),
1982 => array(6 => 1),
1983 => array(6 => 1),
1985 => array(6 => 1),
1987 => array(12 => 1),
1989 => array(12 => 1),
1990 => array(12 => 1),
1992 => array(6 => 1),
1993 => array(6 => 1),
1994 => array(6 => 1),
1995 => array(12 => 1),
1997 => array(6 => 1),
1998 => array(12 => 1),
2005 => array(12 => 1));
}
$ret = Date_Calc::daysInMonth($pn_month, $pn_year) * 86400;
if (isset($ha_leapseconds[$pn_year][$pn_month])) {
return $ret + $ha_leapseconds[$pn_year][$pn_month];
} else {
return $ret;
}
}
// }}}
// {{{ getSecondsInDay()
/**
* Returns the total number of seconds in the day of the given date
*
* This takes into account leap seconds.
*
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year in four digit format
*
* @return int
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getSecondsInDay($pn_day, $pn_month, $pn_year)
{
// Note to developers:
//
// The leap seconds listed here are a matter of historical fact,
// that is, it is known on which exact day they occurred.
// However, the implementation of the class as a whole depends
// on the fact that they always occur at the end of the month
// (although it is assumed that they could occur in any month,
// even though practically they only occur in June or December).
//
// Do not define a leap second on a day of the month other than
// the last day without altering the implementation of the
// functions that depend on this one.
//
// It is possible, though, to define an un-leap second (i.e. a skipped
// second (I do not know what they are called), or a number of
// consecutive leap seconds).
$pn_day = intval($pn_day);
$pn_month = intval($pn_month);
$pn_year = intval($pn_year);
static $ha_leapseconds;
if (!isset($ha_leapseconds)) {
$ha_leapseconds = array(1972 => array(6 => array(30 => 1),
12 => array(31 => 1)),
1973 => array(12 => array(31 => 1)),
1974 => array(12 => array(31 => 1)),
1975 => array(12 => array(31 => 1)),
1976 => array(12 => array(31 => 1)),
1977 => array(12 => array(31 => 1)),
1978 => array(12 => array(31 => 1)),
1979 => array(12 => array(31 => 1)),
1981 => array(6 => array(30 => 1)),
1982 => array(6 => array(30 => 1)),
1983 => array(6 => array(30 => 1)),
1985 => array(6 => array(30 => 1)),
1987 => array(12 => array(31 => 1)),
1989 => array(12 => array(31 => 1)),
1990 => array(12 => array(31 => 1)),
1992 => array(6 => array(30 => 1)),
1993 => array(6 => array(30 => 1)),
1994 => array(6 => array(30 => 1)),
1995 => array(12 => array(31 => 1)),
1997 => array(6 => array(30 => 1)),
1998 => array(12 => array(31 => 1)),
2005 => array(12 => array(31 => 1)));
}
if (isset($ha_leapseconds[$pn_year][$pn_month][$pn_day])) {
return 86400 + $ha_leapseconds[$pn_year][$pn_month][$pn_day];
} else {
return 86400;
}
}
// }}}
// {{{ getSecondsInHour()
/**
* Returns the total number of seconds in the hour of the given date
*
* This takes into account leap seconds.
*
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year in four digit format
* @param int $pn_hour the hour
*
* @return int
* @access public
* @static
*/
public function getSecondsInHour($pn_day, $pn_month, $pn_year, $pn_hour)
{
if ($pn_hour < 23) {
return 3600;
} else {
return Date_Calc::getSecondsInDay($pn_day, $pn_month, $pn_year) -
82800;
}
}
// }}}
// {{{ getSecondsInMinute()
/**
* Returns the total number of seconds in the minute of the given hour
*
* This takes into account leap seconds.
*
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year in four digit format
* @param int $pn_hour the hour
* @param int $pn_minute the minute
*
* @return int
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getSecondsInMinute(
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute
)
{
if ($pn_hour < 23 || $pn_minute < 59) {
return 60;
} else {
return Date_Calc::getSecondsInDay($pn_day, $pn_month, $pn_year) -
86340;
}
}
// }}}
// {{{ secondsPastMidnight()
/**
* Returns the no of seconds since midnight (0-86399)
*
* @param int $pn_hour the hour of the day
* @param int $pn_minute the minute
* @param mixed $pn_second the second as integer or float
*
* @return mixed integer or float from 0-86399
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function secondsPastMidnight($pn_hour, $pn_minute, $pn_second)
{
return 3600 * $pn_hour + 60 * $pn_minute + $pn_second;
}
// }}}
// {{{ secondsPastMidnightToTime()
/**
* Returns the time as an array (i.e. hour, minute, second)
*
* @param mixed $pn_seconds the no of seconds since midnight (0-86399)
*
* @return mixed array of hour, minute (both as integers), second (as
* integer or float, depending on parameter)
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function secondsPastMidnightToTime($pn_seconds)
{
if ($pn_seconds >= 86400) {
return array(23, 59, $pn_seconds - 86340);
}
$hn_hour = intval($pn_seconds / 3600);
$hn_minute = intval(($pn_seconds - $hn_hour * 3600) / 60);
$hn_second = is_float($pn_seconds) ?
fmod($pn_seconds, 60) :
$pn_seconds % 60;
return array($hn_hour, $hn_minute, $hn_second);
}
// }}}
// {{{ secondsPastTheHour()
/**
* Returns the no of seconds since the last hour o'clock (0-3599)
*
* @param int $pn_minute the minute
* @param mixed $pn_second the second as integer or float
*
* @return mixed integer or float from 0-3599
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function secondsPastTheHour($pn_minute, $pn_second)
{
return 60 * $pn_minute + $pn_second;
}
// }}}
// {{{ addHours()
/**
* Returns the date the specified no of hours from the given date
*
* To subtract hours use a negative value for the '$pn_hours' parameter
*
* @param int $pn_hours hours to add
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
* @param int $pn_hour the hour
*
* @return array array of year, month, day, hour
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addHours($pn_hours, $pn_day, $pn_month, $pn_year, $pn_hour)
{
if ($pn_hours == 0) {
return array((int)$pn_year,
(int)$pn_month,
(int)$pn_day,
(int)$pn_hour);
}
$hn_days = intval($pn_hours / 24);
$hn_hour = $pn_hour + $pn_hours % 24;
if ($hn_hour >= 24) {
++$hn_days;
$hn_hour -= 24;
} elseif ($hn_hour < 0) {
--$hn_days;
$hn_hour += 24;
}
if ($hn_days == 0) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
} else {
list($hn_year, $hn_month, $hn_day) =
explode(
" ",
Date_Calc::addDays(
$hn_days,
$pn_day,
$pn_month,
$pn_year,
"%Y %m %d"
)
);
}
return array((int)$hn_year, (int)$hn_month, (int)$hn_day, $hn_hour);
}
// }}}
// {{{ addMinutes()
/**
* Returns the date the specified no of minutes from the given date
*
* To subtract minutes use a negative value for the '$pn_minutes' parameter
*
* @param int $pn_minutes minutes to add
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
* @param int $pn_hour the hour
* @param int $pn_minute the minute
*
* @return array array of year, month, day, hour, minute
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addMinutes(
$pn_minutes,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute
)
{
if ($pn_minutes == 0) {
return array((int)$pn_year,
(int)$pn_month,
(int)$pn_day,
(int)$pn_hour,
(int)$pn_minute);
}
$hn_hours = intval($pn_minutes / 60);
$hn_minute = $pn_minute + $pn_minutes % 60;
if ($hn_minute >= 60) {
++$hn_hours;
$hn_minute -= 60;
} elseif ($hn_minute < 0) {
--$hn_hours;
$hn_minute += 60;
}
if ($hn_hours == 0) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
$hn_hour = $pn_hour;
} else {
list($hn_year, $hn_month, $hn_day, $hn_hour) =
Date_Calc::addHours(
$hn_hours,
$pn_day,
$pn_month,
$pn_year,
$pn_hour
);
}
return array($hn_year, $hn_month, $hn_day, $hn_hour, $hn_minute);
}
// }}}
// {{{ addSeconds()
/**
* Returns the date the specified no of seconds from the given date
*
* If leap seconds are specified to be counted, the passed time must be UTC.
* To subtract seconds use a negative value for the '$pn_seconds' parameter.
*
* N.B. the return type of the second part of the date is float if
* either '$pn_seconds' or '$pn_second' is a float; otherwise, it
* is integer.
*
* @param mixed $pn_seconds seconds to add as integer or float
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
* @param int $pn_hour the hour
* @param int $pn_minute the minute
* @param mixed $pn_second the second as integer or float
* @param bool $pb_countleap whether to count leap seconds (defaults to
* DATE_COUNT_LEAP_SECONDS)
*
* @return array array of year, month, day, hour, minute, second
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addSeconds(
$pn_seconds,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute,
$pn_second,
$pb_countleap = DATE_COUNT_LEAP_SECONDS
)
{
if ($pn_seconds == 0) {
return array((int)$pn_year,
(int)$pn_month,
(int)$pn_day,
(int)$pn_hour,
(int)$pn_minute,
$pn_second);
}
if ($pb_countleap) {
$hn_seconds = $pn_seconds;
$hn_day = (int)$pn_day;
$hn_month = (int)$pn_month;
$hn_year = (int)$pn_year;
$hn_hour = (int)$pn_hour;
$hn_minute = (int)$pn_minute;
$hn_second = $pn_second;
$hn_days = Date_Calc::dateToDays(
$pn_day,
$pn_month,
$pn_year
);
$hn_secondsofmonth = 86400 * ($hn_days -
Date_Calc::firstDayOfMonth(
$pn_month,
$pn_year
)) +
Date_Calc::secondsPastMidnight(
$pn_hour,
$pn_minute,
$pn_second
);
if ($hn_seconds > 0) {
// Advance to end of month:
//
if ($hn_secondsofmonth != 0 &&
$hn_secondsofmonth + $hn_seconds >=
($hn_secondsinmonth =
Date_Calc::getSecondsInMonth($hn_month, $hn_year))) {
$hn_seconds -= $hn_secondsinmonth - $hn_secondsofmonth;
$hn_secondsofmonth = 0;
list($hn_year, $hn_month) =
Date_Calc::nextMonth($hn_month, $hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
$hn_hour = $hn_minute = $hn_second = 0;
}
// Advance to end of year:
//
if ($hn_secondsofmonth == 0 &&
$hn_month != Date_Calc::getFirstMonthOfYear($hn_year)) {
while ($hn_year == $pn_year &&
$hn_seconds >= ($hn_secondsinmonth =
Date_Calc::getSecondsInMonth(
$hn_month,
$hn_year
))) {
$hn_seconds -= $hn_secondsinmonth;
list($hn_year, $hn_month) =
Date_Calc::nextMonth($hn_month, $hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
}
}
if ($hn_secondsofmonth == 0) {
// Add years:
//
if ($hn_month == Date_Calc::getFirstMonthOfYear($hn_year)) {
while ($hn_seconds >= ($hn_secondsinyear =
Date_Calc::getSecondsInYear($hn_year))) {
$hn_seconds -= $hn_secondsinyear;
$hn_month = Date_Calc::getFirstMonthOfYear(++$hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
}
}
// Add months:
//
while ($hn_seconds >= ($hn_secondsinmonth =
Date_Calc::getSecondsInMonth($hn_month, $hn_year))) {
$hn_seconds -= $hn_secondsinmonth;
list($hn_year, $hn_month) =
Date_Calc::nextMonth($hn_month, $hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth($hn_month, $hn_year);
}
}
} else {
//
// (if $hn_seconds < 0)
// Go back to start of month:
//
if ($hn_secondsofmonth != 0 &&
-$hn_seconds >= $hn_secondsofmonth) {
$hn_seconds += $hn_secondsofmonth;
$hn_secondsofmonth = 0;
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
$hn_hour = $hn_minute = $hn_second = 0;
}
// Go back to start of year:
//
if ($hn_secondsofmonth == 0) {
while ($hn_month !=
Date_Calc::getFirstMonthOfYear($hn_year)) {
list($hn_year, $hn_prevmonth) =
Date_Calc::prevMonth($hn_month, $hn_year);
if (-$hn_seconds >= ($hn_secondsinmonth =
Date_Calc::getSecondsInMonth(
$hn_prevmonth,
$hn_year
))) {
$hn_seconds += $hn_secondsinmonth;
$hn_month = $hn_prevmonth;
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
} else {
break;
}
}
}
if ($hn_secondsofmonth == 0) {
// Subtract years:
//
if ($hn_month == Date_Calc::getFirstMonthOfYear($hn_year)) {
while (-$hn_seconds >= ($hn_secondsinyear =
Date_Calc::getSecondsInYear($hn_year - 1))) {
$hn_seconds += $hn_secondsinyear;
$hn_month = Date_Calc::getFirstMonthOfYear(--$hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
}
}
// Subtract months:
//
list($hn_pmyear, $hn_prevmonth) =
Date_Calc::prevMonth($hn_month, $hn_year);
while (-$hn_seconds >= ($hn_secondsinmonth =
Date_Calc::getSecondsInMonth(
$hn_prevmonth,
$hn_pmyear
))) {
$hn_seconds += $hn_secondsinmonth;
$hn_year = $hn_pmyear;
$hn_month = $hn_prevmonth;
$hn_day = Date_Calc::getFirstDayOfMonth(
$hn_month,
$hn_year
);
list($hn_pmyear, $hn_prevmonth) =
Date_Calc::prevMonth($hn_month, $hn_year);
}
}
}
if ($hn_seconds < 0 && $hn_secondsofmonth == 0) {
list($hn_year, $hn_month) =
Date_Calc::prevMonth($hn_month, $hn_year);
$hn_day = Date_Calc::getFirstDayOfMonth($hn_month, $hn_year);
$hn_seconds += Date_Calc::getSecondsInMonth($hn_month, $hn_year);
}
$hn_seconds += Date_Calc::secondsPastMidnight(
$hn_hour,
$hn_minute,
$hn_second
);
if ($hn_seconds < 0) {
$hn_daysadd = intval($hn_seconds / 86400) - 1;
} elseif ($hn_seconds < 86400) {
$hn_daysadd = 0;
} else {
$hn_daysadd = intval($hn_seconds / 86400) - 1;
}
if ($hn_daysadd != 0) {
list($hn_year, $hn_month, $hn_day) =
explode(
" ",
Date_Calc::addDays(
$hn_daysadd,
$hn_day,
$hn_month,
$hn_year,
"%Y %m %d"
)
);
$hn_seconds -= $hn_daysadd * 86400;
}
$hn_secondsinday = Date_Calc::getSecondsInDay(
$hn_day,
$hn_month,
$hn_year
);
if ($hn_seconds >= $hn_secondsinday) {
list($hn_year, $hn_month, $hn_day) =
explode(
" ",
Date_Calc::addDays(
1,
$hn_day,
$hn_month,
$hn_year,
"%Y %m %d"
)
);
$hn_seconds -= $hn_secondsinday;
}
list($hn_hour, $hn_minute, $hn_second) =
Date_Calc::secondsPastMidnightToTime($hn_seconds);
return array((int)$hn_year,
(int)$hn_month,
(int)$hn_day,
$hn_hour,
$hn_minute,
$hn_second);
} else {
// Assume every day has 86400 seconds exactly (ignore leap seconds):
//
$hn_minutes = intval($pn_seconds / 60);
if (is_float($pn_seconds)) {
$hn_second = $pn_second + fmod($pn_seconds, 60);
} else {
$hn_second = $pn_second + $pn_seconds % 60;
}
if ($hn_second >= 60) {
++$hn_minutes;
$hn_second -= 60;
} elseif ($hn_second < 0) {
--$hn_minutes;
$hn_second += 60;
}
if ($hn_minutes == 0) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
$hn_hour = $pn_hour;
$hn_minute = $pn_minute;
} else {
list($hn_year, $hn_month, $hn_day, $hn_hour, $hn_minute) =
Date_Calc::addMinutes(
$hn_minutes,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute
);
}
return array($hn_year,
$hn_month,
$hn_day,
$hn_hour,
$hn_minute,
$hn_second);
}
}
// }}}
// {{{ dateToDays()
/**
* Converts a date in the proleptic Gregorian calendar to the no of days
* since 24th November, 4714 B.C.
*
* Returns the no of days since Monday, 24th November, 4714 B.C. in the
* proleptic Gregorian calendar (which is 24th November, -4713 using
* 'Astronomical' year numbering, and 1st January, 4713 B.C. in the
* proleptic Julian calendar). This is also the first day of the 'Julian
* Period' proposed by Joseph Scaliger in 1583, and the number of days
* since this date is known as the 'Julian Day'. (It is not directly
* to do with the Julian calendar, although this is where the name
* is derived from.)
*
* The algorithm is valid for all years (positive and negative), and
* also for years preceding 4714 B.C.
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year (using 'Astronomical' year numbering)
*
* @return int the number of days since 24th November, 4714 B.C.
* @access public
* @static
*/
public function dateToDays($day, $month, $year)
{
if ($month > 2) {
// March = 0, April = 1, ..., December = 9,
// January = 10, February = 11
$month -= 3;
} else {
$month += 9;
--$year;
}
$hb_negativeyear = $year < 0;
$century = intval($year / 100);
$year = $year % 100;
if ($hb_negativeyear) {
// Subtract 1 because year 0 is a leap year;
// And N.B. that we must treat the leap years as occurring
// one year earlier than they do, because for the purposes
// of calculation, the year starts on 1st March:
//
return intval((14609700 * $century + ($year == 0 ? 1 : 0)) / 400) +
intval((1461 * $year + 1) / 4) +
intval((153 * $month + 2) / 5) +
$day + 1721118;
} else {
return intval(146097 * $century / 4) +
intval(1461 * $year / 4) +
intval((153 * $month + 2) / 5) +
$day + 1721119;
}
}
// }}}
// {{{ daysToDate()
/**
* Converts no of days since 24th November, 4714 B.C. (in the proleptic
* Gregorian calendar, which is year -4713 using 'Astronomical' year
* numbering) to Gregorian calendar date
*
* Returned date belongs to the proleptic Gregorian calendar, using
* 'Astronomical' year numbering.
*
* The algorithm is valid for all years (positive and negative), and
* also for years preceding 4714 B.C. (i.e. for negative 'Julian Days'),
* and so the only limitation is platform-dependent (for 32-bit systems
* the maximum year would be something like about 1,465,190 A.D.).
*
* N.B. Monday, 24th November, 4714 B.C. is Julian Day '0'.
*
* @param int $days the number of days since 24th November, 4714 B.C.
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function daysToDate($days, $format = DATE_CALC_FORMAT)
{
$days = intval($days);
$days -= 1721119;
$century = floor((4 * $days - 1) / 146097);
$days = floor(4 * $days - 1 - 146097 * $century);
$day = floor($days / 4);
$year = floor((4 * $day + 3) / 1461);
$day = floor(4 * $day + 3 - 1461 * $year);
$day = floor(($day + 4) / 4);
$month = floor((5 * $day - 3) / 153);
$day = floor(5 * $day - 3 - 153 * $month);
$day = floor(($day + 5) / 5);
$year = $century * 100 + $year;
if ($month < 10) {
$month += 3;
} else {
$month -= 9;
++$year;
}
return Date_Calc::dateFormat($day, $month, $year, $format);
}
// }}}
// {{{ getMonths()
/**
* Returns array of the month numbers, in order, for the given year
*
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return array array of integer month numbers, in order
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getMonths($pn_year)
{
// N.B. Month numbers can be skipped but not duplicated:
//
return array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
}
// }}}
// {{{ getMonthNames()
/**
* Returns an array of month names
*
* Used to take advantage of the setlocale function to return
* language specific month names.
*
* TODO: cache values to some global array to avoid performance
* hits when called more than once.
*
* @param int $pb_abbreviated whether to return the abbreviated form of the
* months
*
* @return array associative array of integer month numbers, in
* order, to month names
* @access public
* @static
*/
public function getMonthNames($pb_abbreviated = false)
{
$ret = array();
foreach (Date_Calc::getMonths(2001) as $i) {
$ret[$i] = strftime(
$pb_abbreviated ? '%b' : '%B',
mktime(0, 0, 0, $i, 1, 2001)
);
}
return $ret;
}
// }}}
// {{{ prevMonth()
/**
* Returns month and year of previous month
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return array array of year, month as integers
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function prevMonth($pn_month, $pn_year)
{
$ha_months = Date_Calc::getMonths($pn_year);
$hn_monthkey = array_search($pn_month, $ha_months);
if (array_key_exists($hn_monthkey - 1, $ha_months)) {
return array((int)$pn_year, $ha_months[$hn_monthkey - 1]);
} else {
$ha_months = Date_Calc::getMonths($pn_year - 1);
return array($pn_year - 1, end($ha_months));
}
}
// }}}
// {{{ nextMonth()
/**
* Returns month and year of next month
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return array array of year, month as integers
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function nextMonth($pn_month, $pn_year)
{
$ha_months = Date_Calc::getMonths($pn_year);
$hn_monthkey = array_search($pn_month, $ha_months);
if (array_key_exists($hn_monthkey + 1, $ha_months)) {
return array((int)$pn_year, $ha_months[$hn_monthkey + 1]);
} else {
$ha_months = Date_Calc::getMonths($pn_year + 1);
return array($pn_year + 1, $ha_months[0]);
}
}
// }}}
// {{{ addMonthsToDays()
/**
* Returns 'Julian Day' of the date the specified no of months
* from the given date
*
* To subtract months use a negative value for the '$pn_months'
* parameter
*
* @param int $pn_months months to add
* @param int $pn_days 'Julian Day', i.e. the no of days since 1st
* January, 4713 B.C.
*
* @return int 'Julian Day', i.e. the no of days since 1st January,
* 4713 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addMonthsToDays($pn_months, $pn_days)
{
if ($pn_months == 0) {
return (int)$pn_days;
}
list($hn_year, $hn_month, $hn_day) =
explode(" ", Date_Calc::daysToDate($pn_days, "%Y %m %d"));
$hn_retmonth = $hn_month + $pn_months % 12;
$hn_retyear = $hn_year + intval($pn_months / 12);
if ($hn_retmonth < 1) {
$hn_retmonth += 12;
--$hn_retyear;
} elseif ($hn_retmonth > 12) {
$hn_retmonth -= 12;
++$hn_retyear;
}
if (Date_Calc::isValidDate($hn_day, $hn_retmonth, $hn_retyear)) {
return Date_Calc::dateToDays($hn_day, $hn_retmonth, $hn_retyear);
}
// Calculate days since first of month:
//
$hn_dayoffset = $pn_days -
Date_Calc::firstDayOfMonth($hn_month, $hn_year);
$hn_retmonthfirstday = Date_Calc::firstDayOfMonth(
$hn_retmonth,
$hn_retyear
);
$hn_retmonthlastday = Date_Calc::lastDayOfMonth(
$hn_retmonth,
$hn_retyear
);
if ($hn_dayoffset > $hn_retmonthlastday - $hn_retmonthfirstday) {
return $hn_retmonthlastday;
} else {
return $hn_retmonthfirstday + $hn_dayoffset;
}
}
// }}}
// {{{ addMonths()
/**
* Returns the date the specified no of months from the given date
*
* To subtract months use a negative value for the '$pn_months'
* parameter
*
* @param int $pn_months months to add
* @param int $pn_day the day of the month, default is current local
* day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param string $ps_format string specifying how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addMonths(
$pn_months,
$pn_day,
$pn_month,
$pn_year,
$ps_format = DATE_CALC_FORMAT
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
if ($pn_months == 0) {
return Date_Calc::dateFormat(
$pn_day,
$pn_month,
$pn_year,
$ps_format
);
}
$hn_days = Date_Calc::dateToDays($pn_day, $pn_month, $pn_year);
return Date_Calc::daysToDate(
Date_Calc::addMonthsToDays(
$pn_months,
$hn_days
),
$ps_format
);
}
// }}}
// {{{ addYearsToDays()
/**
* Returns 'Julian Day' of the date the specified no of years
* from the given date
*
* To subtract years use a negative value for the '$pn_years'
* parameter
*
* @param int $pn_years years to add
* @param int $pn_days 'Julian Day', i.e. the no of days since 1st January,
* 4713 B.C.
*
* @return int 'Julian Day', i.e. the no of days since 1st January,
* 4713 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addYearsToDays($pn_years, $pn_days)
{
if ($pn_years == 0) {
return (int)$pn_days;
}
list($hn_year, $hn_month, $hn_day) =
explode(" ", Date_Calc::daysToDate($pn_days, "%Y %m %d"));
$hn_retyear = $hn_year + $pn_years;
if (Date_Calc::isValidDate($hn_day, $hn_month, $hn_retyear)) {
return Date_Calc::dateToDays($hn_day, $hn_month, $hn_retyear);
}
$ha_months = Date_Calc::getMonths($hn_retyear);
if (in_array($hn_month, $ha_months)) {
$hn_retmonth = $hn_month;
// Calculate days since first of month:
//
$hn_dayoffset = $pn_days - Date_Calc::firstDayOfMonth(
$hn_month,
$hn_year
);
$hn_retmonthfirstday = Date_Calc::firstDayOfMonth(
$hn_retmonth,
$hn_retyear
);
$hn_retmonthlastday = Date_Calc::lastDayOfMonth(
$hn_retmonth,
$hn_retyear
);
if ($hn_dayoffset > $hn_retmonthlastday - $hn_retmonthfirstday) {
return $hn_retmonthlastday;
} else {
return $hn_retmonthfirstday + $hn_dayoffset;
}
} else {
// Calculate days since first of year:
//
$hn_dayoffset = $pn_days - Date_Calc::firstDayOfYear($hn_year);
$hn_retyearfirstday = Date_Calc::firstDayOfYear($hn_retyear);
$hn_retyearlastday = Date_Calc::lastDayOfYear($hn_retyear);
if ($hn_dayoffset > $hn_retyearlastday - $hn_retyearfirstday) {
return $hn_retyearlastday;
} else {
return $hn_retyearfirstday + $hn_dayoffset;
}
}
}
// }}}
// {{{ addYears()
/**
* Returns the date the specified no of years from the given date
*
* To subtract years use a negative value for the '$pn_years'
* parameter
*
* @param int $pn_years years to add
* @param int $pn_day the day of the month, default is current local
* day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param string $ps_format string specifying how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addYears(
$pn_years,
$pn_day,
$pn_month,
$pn_year,
$ps_format = DATE_CALC_FORMAT
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
if ($pn_years == 0) {
return Date_Calc::dateFormat(
$pn_day,
$pn_month,
$pn_year,
$ps_format
);
}
$hn_days = Date_Calc::dateToDays($pn_day, $pn_month, $pn_year);
return Date_Calc::daysToDate(
Date_Calc::addYearsToDays(
$pn_years,
$hn_days
),
$ps_format
);
}
// }}}
// {{{ addDays()
/**
* Returns the date the specified no of days from the given date
*
* To subtract days use a negative value for the '$pn_days' parameter
*
* @param int $pn_days days to add
* @param int $pn_day the day of the month, default is current local
* day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param string $ps_format string specifying how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function addDays(
$pn_days,
$pn_day,
$pn_month,
$pn_year,
$ps_format = DATE_CALC_FORMAT
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
if ($pn_days == 0) {
return Date_Calc::dateFormat(
$pn_day,
$pn_month,
$pn_year,
$ps_format
);
}
return Date_Calc::daysToDate(
Date_Calc::dateToDays(
$pn_day,
$pn_month,
$pn_year
) +
$pn_days,
$ps_format
);
}
// }}}
// {{{ getFirstDayOfMonth()
/**
* Returns first day of the specified month of specified year as integer
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return int number of first day of month
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getFirstDayOfMonth($pn_month, $pn_year)
{
return 1;
}
// }}}
// {{{ getLastDayOfMonth()
/**
* Returns last day of the specified month of specified year as integer
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return int number of last day of month
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getLastDayOfMonth($pn_month, $pn_year)
{
return Date_Calc::daysInMonth($pn_month, $pn_year);
}
// }}}
// {{{ firstDayOfMonth()
/**
* Returns the Julian Day of the first day of the month of the specified
* year (i.e. the no of days since 24th November, 4714 B.C.)
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return integer the number of days since 24th November, 4714 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function firstDayOfMonth($pn_month, $pn_year)
{
return Date_Calc::dateToDays(
Date_Calc::getFirstDayOfMonth(
$pn_month,
$pn_year
),
$pn_month,
$pn_year
);
}
// }}}
// {{{ lastDayOfMonth()
/**
* Returns the Julian Day of the last day of the month of the specified
* year (i.e. the no of days since 24th November, 4714 B.C.)
*
* @param int $pn_month the month
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return integer the number of days since 24th November, 4714 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function lastDayOfMonth($pn_month, $pn_year)
{
list($hn_nmyear, $hn_nextmonth) = Date_Calc::nextMonth(
$pn_month,
$pn_year
);
return Date_Calc::firstDayOfMonth($hn_nextmonth, $hn_nmyear) - 1;
}
// }}}
// {{{ getFirstMonthOfYear()
/**
* Returns first month of specified year as integer
*
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return int number of first month of year
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function getFirstMonthOfYear($pn_year)
{
$ha_months = Date_Calc::getMonths($pn_year);
return $ha_months[0];
}
// }}}
// {{{ firstDayOfYear()
/**
* Returns the Julian Day of the first day of the year (i.e. the no of
* days since 24th November, 4714 B.C.)
*
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return integer the number of days since 24th November, 4714 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function firstDayOfYear($pn_year)
{
return Date_Calc::firstDayOfMonth(
Date_Calc::getFirstMonthOfYear($pn_year),
$pn_year
);
}
// }}}
// {{{ lastDayOfYear()
/**
* Returns the Julian Day of the last day of the year (i.e. the no of
* days since 24th November, 4714 B.C.)
*
* @param int $pn_year the year (using 'Astronomical' year numbering)
*
* @return integer the number of days since 24th November, 4714 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function lastDayOfYear($pn_year)
{
return Date_Calc::firstDayOfYear($pn_year + 1) - 1;
}
// }}}
// {{{ dateToDaysJulian()
/**
* Converts a date in the proleptic Julian calendar to the no of days
* since 1st January, 4713 B.C.
*
* Returns the no of days since Monday, 1st January, 4713 B.C. in the
* proleptic Julian calendar (which is 1st January, -4712 using
* 'Astronomical' year numbering, and 24th November, 4713 B.C. in the
* proleptic Gregorian calendar). This is also the first day of the 'Julian
* Period' proposed by Joseph Scaliger in 1583, and the number of days
* since this date is known as the 'Julian Day'. (It is not directly
* to do with the Julian calendar, although this is where the name
* is derived from.)
*
* The algorithm is valid for all years (positive and negative), and
* also for years preceding 4713 B.C.
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year (using 'Astronomical' year numbering)
*
* @return int the number of days since 1st January, 4713 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function dateToDaysJulian($day, $month, $year)
{
if ($month > 2) {
// March = 0, April = 1, ..., December = 9,
// January = 10, February = 11
$month -= 3;
} else {
$month += 9;
--$year;
}
$hb_negativeyear = $year < 0;
if ($hb_negativeyear) {
// Subtract 1 because year 0 is a leap year;
// And N.B. that we must treat the leap years as occurring
// one year earlier than they do, because for the purposes
// of calculation, the year starts on 1st March:
//
return intval((1461 * $year + 1) / 4) +
intval((153 * $month + 2) / 5) +
$day + 1721116;
} else {
return intval(1461 * $year / 4) +
floor((153 * $month + 2) / 5) +
$day + 1721117;
}
}
// }}}
// {{{ daysToDateJulian()
/**
* Converts no of days since 1st January, 4713 B.C. (in the proleptic
* Julian calendar, which is year -4712 using 'Astronomical' year
* numbering) to Julian calendar date
*
* Returned date belongs to the proleptic Julian calendar, using
* 'Astronomical' year numbering.
*
* @param int $days the number of days since 1st January, 4713 B.C.
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function daysToDateJulian($days, $format = DATE_CALC_FORMAT)
{
$days = intval($days);
$days -= 1721117;
$days = floor(4 * $days - 1);
$day = floor($days / 4);
$year = floor((4 * $day + 3) / 1461);
$day = floor(4 * $day + 3 - 1461 * $year);
$day = floor(($day + 4) / 4);
$month = floor((5 * $day - 3) / 153);
$day = floor(5 * $day - 3 - 153 * $month);
$day = floor(($day + 5) / 5);
if ($month < 10) {
$month += 3;
} else {
$month -= 9;
++$year;
}
return Date_Calc::dateFormat($day, $month, $year, $format);
}
// }}}
// {{{ isoWeekDate()
/**
* Returns array defining the 'ISO Week Date' as defined in ISO 8601
*
* Expects a date in the proleptic Gregorian calendar using 'Astronomical'
* year numbering, that is, with a year 0. Algorithm is valid for all
* years (positive and negative).
*
* N.B. the ISO week day no for Sunday is defined as 7, whereas this
* class and its related functions defines Sunday as 0.
*
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
*
* @return array array of ISO Year, ISO Week No, ISO Day No as
* integers
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function isoWeekDate($pn_day = 0, $pn_month = 0, $pn_year = null)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_jd = Date_Calc::dateToDays($pn_day, $pn_month, $pn_year);
$hn_wd = Date_Calc::daysToDayOfWeek($hn_jd);
if ($hn_wd == 0) {
$hn_wd = 7;
}
$hn_jd1 = Date_Calc::firstDayOfYear($pn_year);
$hn_day = $hn_jd - $hn_jd1 + 1;
if ($hn_wd <= $hn_jd - Date_Calc::lastDayOfYear($pn_year) + 3) {
// ISO week is the first week of the next ISO year:
//
$hn_year = $pn_year + 1;
$hn_isoweek = 1;
} else {
switch ($hn_wd1 = Date_Calc::daysToDayOfWeek($hn_jd1)) {
case 1:
case 2:
case 3:
case 4:
// Monday - Thursday:
//
$hn_year = $pn_year;
$hn_isoweek = floor(($hn_day + $hn_wd1 - 2) / 7) + 1;
break;
case 0:
$hn_wd1 = 7;
// no break
case 5:
case 6:
// Friday - Sunday:
//
if ($hn_day <= 8 - $hn_wd1) {
// ISO week is the last week of the previous ISO year:
//
list($hn_year, $hn_lastmonth, $hn_lastday) =
explode(
" ",
Date_Calc::daysToDate($hn_jd1 - 1, "%Y %m %d")
);
list($hn_year, $hn_isoweek, $hn_pisoday) =
Date_Calc::isoWeekDate(
$hn_lastday,
$hn_lastmonth,
$hn_year
);
} else {
$hn_year = $pn_year;
$hn_isoweek = floor(($hn_day + $hn_wd1 - 9) / 7) + 1;
}
break;
}
}
return array((int)$hn_year, (int)$hn_isoweek, (int)$hn_wd);
}
// }}}
// {{{ gregorianToISO()
/**
* Converts from Gregorian Year-Month-Day to ISO Year-WeekNumber-WeekDay
*
* Uses ISO 8601 definitions.
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return string the date in ISO Year-WeekNumber-WeekDay format
* @access public
* @static
*/
public function gregorianToISO($day, $month, $year)
{
list($yearnumber, $weeknumber, $weekday) =
Date_Calc::isoWeekDate($day, $month, $year);
return sprintf("%04d", $yearnumber) .
'-' .
sprintf("%02d", $weeknumber) .
'-' .
$weekday;
}
// }}}
// {{{ weekOfYear4th()
/**
* Returns week of the year counting week 1 as the week that contains 4th
* January
*
* Week 1 is determined to be the week that includes the 4th January, and
* therefore can be defined as the first week of the year that has at least
* 4 days. The previous week is counted as week 52 or 53 of the previous
* year. Note that this definition depends on which day is the first day of
* the week, and that if this is not passed as the '$pn_firstdayofweek'
* parameter, the default is assumed.
*
* Note also that the last day week of the year is likely to extend into
* the following year, except in the case that the last day of the week
* falls on 31st December.
*
* Also note that this is very similar to the ISO week returned by
* {@link Date::isoWeekDate()}, the difference being that the ISO week
* always has 7 days, and if the 4th of January is a Friday, for example,
* ISO week 1 would start on Monday, 31st December in the previous year,
* whereas the week defined by this function would start on 1st January,
* but would be only 6 days long. Of course you can also set the day
* of the week, whereas the ISO week starts on a Monday by definition.
*
* Returned week is an integer from 1 to 53.
*
* @param int $pn_day the day of the month, default is current
* local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param int $pn_firstdayofweek optional integer specifying the first day
* of the week
*
* @return array array of year, week no as integers
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfYear4th(
$pn_day = 0,
$pn_month = 0,
$pn_year = null,
$pn_firstdayofweek = DATE_CALC_BEGIN_WEEKDAY
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_wd1 = Date_Calc::daysToDayOfWeek(Date_Calc::firstDayOfYear($pn_year));
$hn_day = Date_Calc::dayOfYear($pn_day, $pn_month, $pn_year);
$hn_week = floor(($hn_day +
(10 + $hn_wd1 - $pn_firstdayofweek) % 7 +
3) / 7);
if ($hn_week > 0) {
$hn_year = $pn_year;
} else {
// Week number is the last week of the previous year:
//
list($hn_year, $hn_lastmonth, $hn_lastday) =
explode(
" ",
Date_Calc::daysToDate(
Date_Calc::lastDayOfYear($pn_year - 1),
"%Y %m %d"
)
);
list($hn_year, $hn_week) =
Date_Calc::weekOfYear4th(
$hn_lastday,
$hn_lastmonth,
$hn_year,
$pn_firstdayofweek
);
}
return array((int)$hn_year, (int)$hn_week);
}
// }}}
// {{{ weekOfYear7th()
/**
* Returns week of the year counting week 1 as the week that contains 7th
* January
*
* Week 1 is determined to be the week that includes the 7th January, and
* therefore can be defined as the first full week of the year. The
* previous week is counted as week 52 or 53 of the previous year. Note
* that this definition depends on which day is the first day of the week,
* and that if this is not passed as the '$pn_firstdayofweek' parameter, the
* default is assumed.
*
* Note also that the last day week of the year is likely to extend into
* the following year, except in the case that the last day of the week
* falls on 31st December.
*
* Returned week is an integer from 1 to 53.
*
* @param int $pn_day the day of the month, default is current
* local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param int $pn_firstdayofweek optional integer specifying the first day
* of the week
*
* @return array array of year, week no as integers
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfYear7th(
$pn_day = 0,
$pn_month = 0,
$pn_year = null,
$pn_firstdayofweek = DATE_CALC_BEGIN_WEEKDAY
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_wd1 = Date_Calc::daysToDayOfWeek(Date_Calc::firstDayOfYear($pn_year));
$hn_day = Date_Calc::dayOfYear($pn_day, $pn_month, $pn_year);
$hn_week = floor(($hn_day + (6 + $hn_wd1 - $pn_firstdayofweek) % 7) / 7);
if ($hn_week > 0) {
$hn_year = $pn_year;
} else {
// Week number is the last week of the previous ISO year:
//
list($hn_year, $hn_lastmonth, $hn_lastday) = explode(" ", Date_Calc::daysToDate(Date_Calc::lastDayOfYear($pn_year - 1), "%Y %m %d"));
list($hn_year, $hn_week) = Date_Calc::weekOfYear7th($hn_lastday, $hn_lastmonth, $hn_year, $pn_firstdayofweek);
}
return array((int)$hn_year, (int)$hn_week);
}
// }}}
// {{{ dateSeason()
/**
* Determines julian date of the given season
*
* @param string $season the season to get the date for: VERNALEQUINOX,
* SUMMERSOLSTICE, AUTUMNALEQUINOX,
* or WINTERSOLSTICE
* @param string $year the year in four digit format. Must be between
* -1000 B.C. and 3000 A.D.
*
* @return float the julian date the season starts on
* @access public
* @static
*/
public function dateSeason($season, $year = 0)
{
if ($year == '') {
$year = Date_Calc::dateNow('%Y');
}
if (($year >= -1000) && ($year <= 1000)) {
$y = $year / 1000.0;
switch ($season) {
case 'VERNALEQUINOX':
$juliandate = (((((((-0.00071 * $y) - 0.00111) * $y) + 0.06134) * $y) + 365242.1374) * $y) + 1721139.29189;
break;
case 'SUMMERSOLSTICE':
$juliandate = (((((((0.00025 * $y) + 0.00907) * $y) - 0.05323) * $y) + 365241.72562) * $y) + 1721233.25401;
break;
case 'AUTUMNALEQUINOX':
$juliandate = (((((((0.00074 * $y) - 0.00297) * $y) - 0.11677) * $y) + 365242.49558) * $y) + 1721325.70455;
break;
case 'WINTERSOLSTICE':
default:
$juliandate = (((((((-0.00006 * $y) - 0.00933) * $y) - 0.00769) * $y) + 365242.88257) * $y) + 1721414.39987;
}
} elseif (($year > 1000) && ($year <= 3000)) {
$y = ($year - 2000) / 1000;
switch ($season) {
case 'VERNALEQUINOX':
$juliandate = (((((((-0.00057 * $y) - 0.00411) * $y) + 0.05169) * $y) + 365242.37404) * $y) + 2451623.80984;
break;
case 'SUMMERSOLSTICE':
$juliandate = (((((((-0.0003 * $y) + 0.00888) * $y) + 0.00325) * $y) + 365241.62603) * $y) + 2451716.56767;
break;
case 'AUTUMNALEQUINOX':
$juliandate = (((((((0.00078 * $y) + 0.00337) * $y) - 0.11575) * $y) + 365242.01767) * $y) + 2451810.21715;
break;
case 'WINTERSOLSTICE':
default:
$juliandate = (((((((0.00032 * $y) - 0.00823) * $y) - 0.06223) * $y) + 365242.74049) * $y) + 2451900.05952;
}
}
return $juliandate;
}
// }}}
// {{{ dayOfYear()
/**
* Returns number of days since 31 December of year before given date
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
*
* @return int
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function dayOfYear($pn_day = 0, $pn_month = 0, $pn_year = null)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_jd = Date_Calc::dateToDays($pn_day, $pn_month, $pn_year);
$hn_jd1 = Date_Calc::firstDayOfYear($pn_year);
return $hn_jd - $hn_jd1 + 1;
}
// }}}
// {{{ julianDate()
/**
* Returns number of days since 31 December of year before given date
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
*
* @return int
* @access public
* @static
* @deprecated Method deprecated in Release 1.5.0
*/
public function julianDate($pn_day = 0, $pn_month = 0, $pn_year = null)
{
return Date_Calc::dayOfYear($pn_day, $pn_month, $pn_year);
}
// }}}
// {{{ getWeekdayFullname()
/**
* Returns the full weekday name for the given date
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
*
* @return string the full name of the day of the week
* @access public
* @static
*/
public function getWeekdayFullname($pn_day = 0, $pn_month = 0, $pn_year = null)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$weekday_names = Date_Calc::getWeekDays();
$weekday = Date_Calc::dayOfWeek($pn_day, $pn_month, $pn_year);
return $weekday_names[$weekday];
}
// }}}
// {{{ getWeekdayAbbrname()
/**
* Returns the abbreviated weekday name for the given date
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
* @param int $length the length of abbreviation
*
* @return string the abbreviated name of the day of the week
* @access public
* @static
* @see Date_Calc::getWeekdayFullname()
*/
public function getWeekdayAbbrname(
$pn_day = 0,
$pn_month = 0,
$pn_year = null,
$length = 3
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$weekday_names = Date_Calc::getWeekDays(true);
$weekday = Date_Calc::dayOfWeek($pn_day, $pn_month, $pn_year);
return $weekday_names[$weekday];
}
// }}}
// {{{ getMonthFullname()
/**
* Returns the full month name for the given month
*
* @param int $month the month
*
* @return string the full name of the month
* @access public
* @static
*/
public function getMonthFullname($month)
{
$month = (int)$month;
if (empty($month)) {
$month = (int)Date_Calc::dateNow('%m');
}
$month_names = Date_Calc::getMonthNames();
return $month_names[$month];
}
// }}}
// {{{ getMonthAbbrname()
/**
* Returns the abbreviated month name for the given month
*
* @param int $month the month
* @param int $length the length of abbreviation
*
* @return string the abbreviated name of the month
* @access public
* @static
* @see Date_Calc::getMonthFullname
*/
public function getMonthAbbrname($month, $length = 3)
{
$month = (int)$month;
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
$month_names = Date_Calc::getMonthNames(true);
return $month_names[$month];
}
// }}}
// {{{ getMonthFromFullname()
/**
* Returns the numeric month from the month name or an abreviation
*
* Both August and Aug would return 8.
*
* @param string $month the name of the month to examine.
* Case insensitive.
*
* @return int the month's number
* @access public
* @static
*/
public function getMonthFromFullName($month)
{
$month = strtolower($month);
$months = Date_Calc::getMonthNames();
while (list($id, $name) = each($months)) {
if (preg_match('/' . $month . '/', strtolower($name))) {
return $id;
}
}
return 0;
}
// }}}
// {{{ getWeekDays()
/**
* Returns an array of week day names
*
* Used to take advantage of the setlocale function to return language
* specific week days.
*
* @param int $pb_abbreviated whether to return the abbreviated form of the
* days
*
* @return array an array of week-day names
* @access public
* @static
*/
public function getWeekDays($pb_abbreviated = false)
{
for ($i = 0; $i < 7; $i++) {
$weekdays[$i] = strftime(
$pb_abbreviated ? '%a' : '%A',
mktime(0, 0, 0, 1, $i, 2001)
);
}
return $weekdays;
}
// }}}
// {{{ daysToDayOfWeek()
/**
* Returns day of week for specified 'Julian Day'
*
* The algorithm is valid for all years (positive and negative), and
* also for years preceding 4714 B.C. (i.e. for negative 'Julian Days'),
* and so the only limitation is platform-dependent (for 32-bit systems
* the maximum year would be something like about 1,465,190 A.D.).
*
* N.B. Monday, 24th November, 4714 B.C. is Julian Day '0'.
*
* @param int $pn_days the number of days since 24th November, 4714 B.C.
*
* @return int integer from 0 to 7 where 0 represents Sunday
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function daysToDayOfWeek($pn_days)
{
// On Julian day 0 the day is Monday (PHP day 1):
//
$ret = ($pn_days + 1) % 7;
return $ret < 0 ? $ret + 7 : $ret;
}
// }}}
// {{{ dayOfWeek()
/**
* Returns day of week for given date (0 = Sunday)
*
* The algorithm is valid for all years (positive and negative).
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
*
* @return int the number of the day in the week
* @access public
* @static
*/
public function dayOfWeek($day = null, $month = null, $year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
// if ($month <= 2) {
// $month += 12;
// --$year;
// }
// $wd = ($day +
// intval((13 * $month + 3) / 5) +
// $year +
// floor($year / 4) -
// floor($year / 100) +
// floor($year / 400) +
// 1) % 7;
// return (int) ($wd < 0 ? $wd + 7 : $wd);
return Date_Calc::daysToDayOfWeek(Date_Calc::dateToDays(
$day,
$month,
$year
));
}
// }}}
// {{{ weekOfYearAbsolute()
/**
* Returns week of the year counting week 1 as 1st-7th January,
* regardless of what day 1st January falls on
*
* Returned value is an integer from 1 to 53. Week 53 will start on
* 31st December and have only one day, except in a leap year, in
* which it will start a day earlier and contain two days.
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
*
* @return int integer from 1 to 53
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfYearAbsolute($pn_day = 0, $pn_month = 0, $pn_year = null)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_day = Date_Calc::dayOfYear($pn_day, $pn_month, $pn_year);
return intval(($hn_day + 6) / 7);
}
// }}}
// {{{ weekOfYear1st()
/**
* Returns week of the year counting week 1 as the week that contains 1st
* January
*
* Week 1 is determined to be the week that includes the 1st January, even
* if this week extends into the previous year, in which case the week will
* only contain between 1 and 6 days of the current year. Note that this
* definition depends on which day is the first day of the week, and that if
* this is not passed as the '$pn_firstdayofweek' parameter, the default is
* assumed.
*
* Note also that the last day week of the year is also likely to contain
* less than seven days, except in the case that the last day of the week
* falls on 31st December.
*
* Returned value is an integer from 1 to 54. The year will only contain
* 54 weeks in the case of a leap year in which 1st January is the last day
* of the week, and 31st December is the first day of the week. In this
* case, both weeks 1 and 54 will contain one day only.
*
* @param int $pn_day the day of the month, default is current
* local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is
* current local year
* @param int $pn_firstdayofweek optional integer specifying the first day
* of the week
*
* @return int integer from 1 to 54
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfYear1st(
$pn_day = 0,
$pn_month = 0,
$pn_year = null,
$pn_firstdayofweek = DATE_CALC_BEGIN_WEEKDAY
)
{
if (is_null($pn_year)) {
$pn_year = Date_Calc::dateNow('%Y');
}
if (empty($pn_month)) {
$pn_month = Date_Calc::dateNow('%m');
}
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
$hn_wd1 = Date_Calc::daysToDayOfWeek(Date_Calc::firstDayOfYear($pn_year));
$hn_day = Date_Calc::dayOfYear($pn_day, $pn_month, $pn_year);
return floor(($hn_day + (7 + $hn_wd1 - $pn_firstdayofweek) % 7 + 6) / 7);
}
// }}}
// {{{ weekOfYear()
/**
* Returns week of the year, where first Sunday is first day of first week
*
* N.B. this function is equivalent to calling:
*
* <code>Date_Calc::weekOfYear7th($day, $month, $year, 0);</code>
*
* Returned week is an integer from 1 to 53.
*
* @param int $pn_day the day of the month, default is current local day
* @param int $pn_month the month, default is current local month
* @param int $pn_year the year in four digit format, default is current
* local year
*
* @return int integer from 1 to 53
* @access public
* @static
* @see Date_Calc::weekOfYear7th
* @deprecated Method deprecated in Release 1.5.0
*/
public function weekOfYear($pn_day = 0, $pn_month = 0, $pn_year = null)
{
$ha_week = Date_Calc::weekOfYear7th($pn_day, $pn_month, $pn_year, 0);
return $ha_week[1];
}
// }}}
// {{{ weekOfMonthAbsolute()
/**
* Returns week of the month counting week 1 as 1st-7th of the month,
* regardless of what day the 1st falls on
*
* Returned value is an integer from 1 to 5. Week 5 will start on
* the 29th of the month and have between 1 and 3 days, except
* in February in a non-leap year, when there will be 4 weeks only.
*
* @param int $pn_day the day of the month, default is current local day
*
* @return int integer from 1 to 5
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfMonthAbsolute($pn_day = 0)
{
if (empty($pn_day)) {
$pn_day = Date_Calc::dateNow('%d');
}
return intval(($pn_day + 6) / 7);
}
// }}}
// {{{ weekOfMonth()
/**
* Alias for 'weekOfMonthAbsolute()'
*
* @param int $pn_day the day of the month, default is current local day
*
* @return int integer from 1 to 5
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function weekOfMonth($pn_day = 0)
{
return Date_Calc::weekOfMonthAbsolute($pn_day);
}
// }}}
// {{{ quarterOfYear()
/**
* Returns quarter of the year for given date
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
*
* @return int the number of the quarter in the year
* @access public
* @static
*/
public function quarterOfYear($day = 0, $month = 0, $year = null)
{
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return intval(($month - 1) / 3 + 1);
}
// }}}
// {{{ daysInMonth()
/**
* Returns the number of days in the given month
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
*
* @return int the number of days the month has
* @access public
* @static
*/
public function daysInMonth($month = 0, $year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::lastDayOfMonth($month, $year) -
Date_Calc::firstDayOfMonth($month, $year) +
1;
}
// }}}
// {{{ daysInYear()
/**
* Returns the number of days in the given year
*
* @param int $year the year in four digit format, default is current local
* year
*
* @return int the number of days the year has
* @access public
* @static
*/
public function daysInYear($year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
return Date_Calc::firstDayOfYear($year + 1) -
Date_Calc::firstDayOfYear($year);
}
// }}}
// {{{ weeksInMonth()
/**
* Returns the number of rows on a calendar month
*
* Useful for determining the number of rows when displaying a typical
* month calendar.
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
*
* @return int the number of weeks the month has
* @access public
* @static
*/
public function weeksInMonth($month = 0, $year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
$FDOM = Date_Calc::firstOfMonthWeekday($month, $year);
if (DATE_CALC_BEGIN_WEEKDAY == 1 && $FDOM == 0) {
$first_week_days = 7 - $FDOM + DATE_CALC_BEGIN_WEEKDAY;
$weeks = 1;
} elseif (DATE_CALC_BEGIN_WEEKDAY == 0 && $FDOM == 6) {
$first_week_days = 7 - $FDOM + DATE_CALC_BEGIN_WEEKDAY;
$weeks = 1;
} else {
$first_week_days = DATE_CALC_BEGIN_WEEKDAY - $FDOM;
$weeks = 0;
}
$first_week_days %= 7;
return ceil((Date_Calc::daysInMonth($month, $year)
- $first_week_days) / 7) + $weeks;
}
// }}}
// {{{ getCalendarWeek()
/**
* Return an array with days in week
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return array $week[$weekday]
* @access public
* @static
*/
public function getCalendarWeek(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$week_array = array();
// date for the column of week
$curr_day = Date_Calc::beginOfWeek($day, $month, $year, '%E');
for ($counter = 0; $counter <= 6; $counter++) {
$week_array[$counter] = Date_Calc::daysToDate($curr_day, $format);
$curr_day++;
}
return $week_array;
}
// }}}
// {{{ getCalendarMonth()
/**
* Return a set of arrays to construct a calendar month for the given date
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return array $month[$row][$col]
* @access public
* @static
*/
public function getCalendarMonth(
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
$month_array = array();
// date for the first row, first column of calendar month
if (DATE_CALC_BEGIN_WEEKDAY == 1) {
if (Date_Calc::firstOfMonthWeekday($month, $year) == 0) {
$curr_day = Date_Calc::firstDayOfMonth($month, $year) - 6;
} else {
$curr_day = Date_Calc::firstDayOfMonth($month, $year)
- Date_Calc::firstOfMonthWeekday($month, $year) + 1;
}
} else {
$curr_day = (Date_Calc::firstDayOfMonth($month, $year)
- Date_Calc::firstOfMonthWeekday($month, $year));
}
// number of days in this month
$daysInMonth = Date_Calc::daysInMonth($month, $year);
$weeksInMonth = Date_Calc::weeksInMonth($month, $year);
for ($row_counter = 0; $row_counter < $weeksInMonth; $row_counter++) {
for ($column_counter = 0; $column_counter <= 6; $column_counter++) {
$month_array[$row_counter][$column_counter] =
Date_Calc::daysToDate($curr_day, $format);
$curr_day++;
}
}
return $month_array;
}
// }}}
// {{{ getCalendarYear()
/**
* Return a set of arrays to construct a calendar year for the given date
*
* @param int $year the year in four digit format, default current
* local year
* @param string $format the string indicating how to format the output
*
* @return array $year[$month][$row][$col]
* @access public
* @static
*/
public function getCalendarYear($year = null, $format = DATE_CALC_FORMAT)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
$year_array = array();
for ($curr_month = 0; $curr_month <= 11; $curr_month++) {
$year_array[$curr_month] =
Date_Calc::getCalendarMonth(
$curr_month + 1,
$year,
$format
);
}
return $year_array;
}
// }}}
// {{{ prevDay()
/**
* Returns date of day before given date
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function prevDay(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
return Date_Calc::addDays(-1, $day, $month, $year, $format);
}
// }}}
// {{{ nextDay()
/**
* Returns date of day after given date
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function nextDay(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
return Date_Calc::addDays(1, $day, $month, $year, $format);
}
// }}}
// {{{ prevWeekday()
/**
* Returns date of the previous weekday, skipping from Monday to Friday
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function prevWeekday(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$days = Date_Calc::dateToDays($day, $month, $year);
if (Date_Calc::dayOfWeek($day, $month, $year) == 1) {
$days -= 3;
} elseif (Date_Calc::dayOfWeek($day, $month, $year) == 0) {
$days -= 2;
} else {
$days -= 1;
}
return Date_Calc::daysToDate($days, $format);
}
// }}}
// {{{ nextWeekday()
/**
* Returns date of the next weekday of given date, skipping from
* Friday to Monday
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function nextWeekday(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$days = Date_Calc::dateToDays($day, $month, $year);
if (Date_Calc::dayOfWeek($day, $month, $year) == 5) {
$days += 3;
} elseif (Date_Calc::dayOfWeek($day, $month, $year) == 6) {
$days += 2;
} else {
$days += 1;
}
return Date_Calc::daysToDate($days, $format);
}
// }}}
// {{{ daysToPrevDayOfWeek()
/**
* Returns 'Julian Day' of the previous specific day of the week
* from the given date.
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $days 'Julian Day', i.e. the no of days since 1st
* January, 4713 B.C.
* @param bool $onorbefore if true and days are same, returns current day
*
* @return int 'Julian Day', i.e. the no of days since 1st January,
* 4713 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function daysToPrevDayOfWeek($dow, $days, $onorbefore = false)
{
$curr_weekday = Date_Calc::daysToDayOfWeek($days);
if ($curr_weekday == $dow) {
if ($onorbefore) {
return $days;
} else {
return $days - 7;
}
} elseif ($curr_weekday < $dow) {
return $days - 7 + $dow - $curr_weekday;
} else {
return $days - $curr_weekday + $dow;
}
}
// }}}
// {{{ prevDayOfWeek()
/**
* Returns date of the previous specific day of the week
* from the given date
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $day the day of the month, default is current local
* day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is
* current local year
* @param string $format the string indicating how to format the output
* @param bool $onorbefore if true and days are same, returns current day
*
* @return string the date in the desired format
* @access public
* @static
*/
public function prevDayOfWeek(
$dow,
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT,
$onorbefore = false
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$days = Date_Calc::dateToDays($day, $month, $year);
$days = Date_Calc::daysToPrevDayOfWeek($dow, $days, $onorbefore);
return Date_Calc::daysToDate($days, $format);
}
// }}}
// {{{ daysToNextDayOfWeek()
/**
* Returns 'Julian Day' of the next specific day of the week
* from the given date.
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $days 'Julian Day', i.e. the no of days since 1st
* January, 4713 B.C.
* @param bool $onorafter if true and days are same, returns current day
*
* @return int 'Julian Day', i.e. the no of days since 1st January,
* 4713 B.C.
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function daysToNextDayOfWeek($dow, $days, $onorafter = false)
{
$curr_weekday = Date_Calc::daysToDayOfWeek($days);
if ($curr_weekday == $dow) {
if ($onorafter) {
return $days;
} else {
return $days + 7;
}
} elseif ($curr_weekday > $dow) {
return $days + 7 - $curr_weekday + $dow;
} else {
return $days + $dow - $curr_weekday;
}
}
// }}}
// {{{ nextDayOfWeek()
/**
* Returns date of the next specific day of the week
* from the given date
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $day the day of the month, default is current local
* day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is
* current local year
* @param string $format the string indicating how to format the output
* @param bool $onorafter if true and days are same, returns current day
*
* @return string the date in the desired format
* @access public
* @static
*/
public function nextDayOfWeek(
$dow,
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT,
$onorafter = false
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$days = Date_Calc::dateToDays($day, $month, $year);
$days = Date_Calc::daysToNextDayOfWeek($dow, $days, $onorafter);
return Date_Calc::daysToDate($days, $format);
}
// }}}
// {{{ prevDayOfWeekOnOrBefore()
/**
* Returns date of the previous specific day of the week
* on or before the given date
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function prevDayOfWeekOnOrBefore(
$dow,
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
return Date_Calc::prevDayOfWeek(
$dow,
$day,
$month,
$year,
$format,
true
);
}
// }}}
// {{{ nextDayOfWeekOnOrAfter()
/**
* Returns date of the next specific day of the week
* on or after the given date
*
* @param int $dow the day of the week (0 = Sunday)
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function nextDayOfWeekOnOrAfter(
$dow,
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
return Date_Calc::nextDayOfWeek(
$dow,
$day,
$month,
$year,
$format,
true
);
}
// }}}
// {{{ beginOfWeek()
/**
* Find the month day of the beginning of week for given date,
* using {@link DATE_CALC_BEGIN_WEEKDAY}
*
* Can return weekday of prev month.
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function beginOfWeek(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$hn_days = Date_Calc::dateToDays($day, $month, $year);
$this_weekday = Date_Calc::daysToDayOfWeek($hn_days);
$interval = (7 - DATE_CALC_BEGIN_WEEKDAY + $this_weekday) % 7;
return Date_Calc::daysToDate($hn_days - $interval, $format);
}
// }}}
// {{{ endOfWeek()
/**
* Find the month day of the end of week for given date,
* using {@link DATE_CALC_BEGIN_WEEKDAY}
*
* Can return weekday of following month.
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function endOfWeek(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$hn_days = Date_Calc::dateToDays($day, $month, $year);
$this_weekday = Date_Calc::daysToDayOfWeek($hn_days);
$interval = (6 + DATE_CALC_BEGIN_WEEKDAY - $this_weekday) % 7;
return Date_Calc::daysToDate($hn_days + $interval, $format);
}
// }}}
// {{{ beginOfPrevWeek()
/**
* Find the month day of the beginning of week before given date,
* using {@link DATE_CALC_BEGIN_WEEKDAY}
*
* Can return weekday of prev month.
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function beginOfPrevWeek(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
list($hn_pwyear, $hn_pwmonth, $hn_pwday) =
explode(" ", Date_Calc::daysToDate(
Date_Calc::dateToDays(
$day,
$month,
$year
) - 7,
'%Y %m %d'
));
return Date_Calc::beginOfWeek(
$hn_pwday,
$hn_pwmonth,
$hn_pwyear,
$format
);
}
// }}}
// {{{ beginOfNextWeek()
/**
* Find the month day of the beginning of week after given date,
* using {@link DATE_CALC_BEGIN_WEEKDAY}
*
* Can return weekday of prev month.
*
* @param int $day the day of the month, default is current local day
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function beginOfNextWeek(
$day = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
list($hn_pwyear, $hn_pwmonth, $hn_pwday) =
explode(
" ",
Date_Calc::daysToDate(
Date_Calc::dateToDays(
$day,
$month,
$year
) + 7,
'%Y %m %d'
)
);
return Date_Calc::beginOfWeek(
$hn_pwday,
$hn_pwmonth,
$hn_pwyear,
$format
);
}
// }}}
// {{{ beginOfMonth()
/**
* Return date of first day of month of given date
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
public function beginOfMonth($month = 0, $year = null, $format = DATE_CALC_FORMAT)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::dateFormat(
Date_Calc::getFirstDayOfMonth(
$month,
$year
),
$month,
$year,
$format
);
}
// }}}
// {{{ endOfMonth()
/**
* Return date of last day of month of given date
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @since Method available since Release 1.5.0
* @deprecated Method deprecated in Release 1.5.0
*/
public function endOfMonth($month = 0, $year = null, $format = DATE_CALC_FORMAT)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::daysToDate(
Date_Calc::lastDayOfMonth($month, $year),
$format
);
}
// }}}
// {{{ beginOfPrevMonth()
/**
* Returns date of the first day of previous month of given date
*
* @param mixed $dummy irrelevant parameter
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
public function beginOfPrevMonth(
$dummy = null,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
list($hn_pmyear, $hn_prevmonth) = Date_Calc::prevMonth($month, $year);
return Date_Calc::dateFormat(
Date_Calc::getFirstDayOfMonth(
$hn_prevmonth,
$hn_pmyear
),
$hn_prevmonth,
$hn_pmyear,
$format
);
}
// }}}
// {{{ endOfPrevMonth()
/**
* Returns date of the last day of previous month for given date
*
* @param mixed $dummy irrelevant parameter
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::endOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
public function endOfPrevMonth(
$dummy = null,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::daysToDate(
Date_Calc::firstDayOfMonth(
$month,
$year
) - 1,
$format
);
}
// }}}
// {{{ beginOfNextMonth()
/**
* Returns date of begin of next month of given date
*
* @param mixed $dummy irrelevant parameter
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
public function beginOfNextMonth(
$dummy = null,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
list($hn_nmyear, $hn_nextmonth) = Date_Calc::nextMonth($month, $year);
return Date_Calc::dateFormat(
Date_Calc::getFirstDayOfMonth(
$hn_nextmonth,
$hn_nmyear
),
$hn_nextmonth,
$hn_nmyear,
$format
);
}
// }}}
// {{{ endOfNextMonth()
/**
* Returns date of the last day of next month of given date
*
* @param mixed $dummy irrelevant parameter
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @see Date_Calc::endOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
public function endOfNextMonth(
$dummy = null,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
list($hn_nmyear, $hn_nextmonth) = Date_Calc::nextMonth($month, $year);
return Date_Calc::daysToDate(
Date_Calc::lastDayOfMonth(
$hn_nextmonth,
$hn_nmyear
),
$format
);
}
// }}}
// {{{ beginOfMonthBySpan()
/**
* Returns date of the first day of the month in the number of months
* from the given date
*
* @param int $months the number of months from the date provided.
* Positive numbers go into the future.
* Negative numbers go into the past.
* Nought is the month presented in $month.
* @param string $month the month, default is current local month
* @param string $year the year in four digit format, default is the
* current local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.4.4
*/
public function beginOfMonthBySpan(
$months = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::addMonths(
$months,
Date_Calc::getFirstDayOfMonth($month, $year),
$month,
$year,
$format
);
}
// }}}
// {{{ endOfMonthBySpan()
/**
* Returns date of the last day of the month in the number of months
* from the given date
*
* @param int $months the number of months from the date provided.
* Positive numbers go into the future.
* Negative numbers go into the past.
* Nought is the month presented in $month.
* @param string $month the month, default is current local month
* @param string $year the year in four digit format, default is the
* current local year
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
* @since Method available since Release 1.4.4
*/
public function endOfMonthBySpan(
$months = 0,
$month = 0,
$year = null,
$format = DATE_CALC_FORMAT
)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
$hn_days = Date_Calc::addMonthsToDays(
$months + 1,
Date_Calc::firstDayOfMonth($month, $year)
) - 1;
return Date_Calc::daysToDate($hn_days, $format);
}
// }}}
// {{{ firstOfMonthWeekday()
/**
* Find the day of the week for the first of the month of given date
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current
* local year
*
* @return int number of weekday for the first day, 0=Sunday
* @access public
* @static
*/
public function firstOfMonthWeekday($month = 0, $year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::daysToDayOfWeek(Date_Calc::firstDayOfMonth(
$month,
$year
));
}
// }}}
// {{{ nWeekdayOfMonth()
/**
* Calculates the date of the Nth weekday of the month,
* such as the second Saturday of January 2000
*
* @param int $week the number of the week to get
* (1 to 5. Also can be 'last'.)
* @param int $dow the day of the week (0 = Sunday)
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
* @access public
* @static
*/
public function nWeekDayOfMonth(
$week,
$dow,
$month,
$year,
$format = DATE_CALC_FORMAT
)
{
if ((is_numeric($week) && ($week < 1 || $week > 5)) ||
(!is_numeric($week) && $week != "last")
) {
return PEAR::raiseError("Invalid week value '$week', only 1-5 or 'last' accepted");
}
if ($dow < 0 || $dow > 6) {
return PEAR::raiseError("Invalid dow value '$dow', only 0-6 accepted");
}
if ($month < 1 || $month > 12) {
return PEAR::raiseError("Invalid month value '$month'");
}
if (is_numeric($week)) {
// the weekday of first day of month "1"
$DOW1 = Date_Calc::dayOfWeek(1, $month, $year);
// finds the sunday
$sunday = ($week - 1) * 7 + 1;
if ($DOW1 > 0) {
$sunday += (7 - $DOW1);
}
// adjust the sunday with dow addition
$wdate = $sunday + $dow;
if ($wdate > Date_Calc::daysInMonth($month, $year)) {
return -1;
} else {
return Date_Calc::dateFormat($wdate, $month, $year, $format);
}
} elseif ($week == 'last' && $dow < 7) {
$lastday = Date_Calc::daysInMonth($month, $year);
$lastdow = Date_Calc::dayOfWeek($lastday, $month, $year);
$diff = $dow - $lastdow;
if ($diff > 0) {
return Date_Calc::dateFormat(
$lastday - (7 - $diff),
$month,
$year,
$format
);
} else {
return Date_Calc::dateFormat(
$lastday + $diff,
$month,
$year,
$format
);
}
} else {
return -1;
}
}
// }}}
// {{{ isValidDate()
/**
* Returns true for valid date, false for invalid date
*
* Uses the proleptic Gregorian calendar, with the year 0 (1 B.C.)
* assumed to be valid and also assumed to be a leap year.
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return bool
* @access public
* @static
*/
public function isValidDate($day, $month, $year)
{
if ($day < 1 || $month < 1 || $month > 12) {
return false;
}
if ($month == 2) {
if (Date_Calc::isLeapYearGregorian($year)) {
return $day <= 29;
} else {
return $day <= 28;
}
} elseif ($month == 4 || $month == 6 || $month == 9 || $month == 11) {
return $day <= 30;
} else {
return $day <= 31;
}
}
// }}}
// {{{ isLeapYearGregorian()
/**
* Returns true for a leap year, else false
*
* Uses the proleptic Gregorian calendar. The year 0 (1 B.C.) is
* assumed in this algorithm to be a leap year. The function is
* valid for all years, positive and negative.
*
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return bool
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function isLeapYearGregorian($year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
return (($year % 4 == 0) &&
($year % 100 != 0)) ||
($year % 400 == 0);
}
// }}}
// {{{ isLeapYearJulian()
/**
* Returns true for a leap year, else false
*
* Uses the proleptic Julian calendar. The year 0 (1 B.C.) is
* assumed in this algorithm to be a leap year. The function is
* valid for all years, positive and negative.
*
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return boolean
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function isLeapYearJulian($year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
return $year % 4 == 0;
}
// }}}
// {{{ isLeapYear()
/**
* Returns true for a leap year, else false
*
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return boolean
* @access public
* @static
*/
public function isLeapYear($year = null)
{
if (is_null($year)) {
$year = Date_Calc::dateNow('%Y');
}
if ($year < 1582) {
// pre Gregorio XIII - 1582
return Date_Calc::isLeapYearJulian($year);
} else {
// post Gregorio XIII - 1582
return Date_Calc::isLeapYearGregorian($year);
}
}
// }}}
// {{{ isFutureDate()
/**
* Determines if given date is a future date from now
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return bool
* @access public
* @static
*/
public function isFutureDate($day, $month, $year)
{
$this_year = Date_Calc::dateNow('%Y');
$this_month = Date_Calc::dateNow('%m');
$this_day = Date_Calc::dateNow('%d');
if ($year > $this_year) {
return true;
} elseif ($year == $this_year) {
if ($month > $this_month) {
return true;
} elseif ($month == $this_month) {
if ($day > $this_day) {
return true;
}
}
}
return false;
}
// }}}
// {{{ isPastDate()
/**
* Determines if given date is a past date from now
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return boolean
* @access public
* @static
*/
public function isPastDate($day, $month, $year)
{
$this_year = Date_Calc::dateNow('%Y');
$this_month = Date_Calc::dateNow('%m');
$this_day = Date_Calc::dateNow('%d');
if ($year < $this_year) {
return true;
} elseif ($year == $this_year) {
if ($month < $this_month) {
return true;
} elseif ($month == $this_month) {
if ($day < $this_day) {
return true;
}
}
}
return false;
}
// }}}
// {{{ dateDiff()
/**
* Returns number of days between two given dates
*
* @param int $day1 the day of the month
* @param int $month1 the month
* @param int $year1 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* @param int $day2 the day of the month
* @param int $month2 the month
* @param int $year2 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return int the absolute number of days between the two dates.
* If an error occurs, -1 is returned.
* @access public
* @static
*/
public function dateDiff($day1, $month1, $year1, $day2, $month2, $year2)
{
if (!Date_Calc::isValidDate($day1, $month1, $year1)) {
return -1;
}
if (!Date_Calc::isValidDate($day2, $month2, $year2)) {
return -1;
}
return abs(Date_Calc::dateToDays($day1, $month1, $year1)
- Date_Calc::dateToDays($day2, $month2, $year2));
}
// }}}
// {{{ compareDates()
/**
* Compares two dates
*
* @param int $day1 the day of the month
* @param int $month1 the month
* @param int $year1 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* @param int $day2 the day of the month
* @param int $month2 the month
* @param int $year2 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
*
* @return int 0 if the dates are equal. 1 if date 1 is later, -1
* if date 1 is earlier.
* @access public
* @static
*/
public static function compareDates($day1, $month1, $year1, $day2, $month2, $year2)
{
$ndays1 = Date_Calc::dateToDays($day1, $month1, $year1);
$ndays2 = Date_Calc::dateToDays($day2, $month2, $year2);
if ($ndays1 == $ndays2) {
return 0;
}
return ($ndays1 > $ndays2) ? 1 : -1;
}
// }}}
// {{{ round()
/**
* Rounds the date according to the specified precision
*
* The precision parameter must be one of the following constants:
*
* - {@link DATE_PRECISION_YEAR}
* - {@link DATE_PRECISION_MONTH}
* - {@link DATE_PRECISION_DAY}
* - {@link DATE_PRECISION_HOUR}
* - {@link DATE_PRECISION_10MINUTES}
* - {@link DATE_PRECISION_MINUTE}
* - {@link DATE_PRECISION_10SECONDS}
* - {@link DATE_PRECISION_SECOND}
*
* The precision can also be specified as an integral offset from
* one of these constants, where the offset reflects a precision
* of 10 to the power of the offset greater than the constant.
* For example:
*
* - <b>(DATE_PRECISION_YEAR - 1)</b> rounds the date to the nearest 10
* years
* - <b>(DATE_PRECISION_YEAR - 3)</b> rounds the date to the nearest 1000
* years
* - <b>(DATE_PRECISION_SECOND + 1)</b> rounds the date to 1 decimal
* point of a second
* - <b>(DATE_PRECISION_SECOND + 1)</b> rounds the date to 3 decimal
* points of a second
* - <b>(DATE_PRECISION_SECOND + 1)</b> rounds the date to the nearest 10
* seconds (thus it is equivalent to
* <b>DATE_PRECISION_10SECONDS</b>)
*
* N.B. This function requires a time in UTC if both the precision is at
* least DATE_PRECISION_SECOND and leap seconds are being counted, otherwise
* any local time is acceptable.
*
* @param int $pn_precision a 'DATE_PRECISION_*' constant (defaults to
* {@link DATE_PRECISION_DAY})
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
* @param int $pn_hour the hour
* @param int $pn_minute the minute
* @param mixed $pn_second the second as integer or float
* @param bool $pb_countleap whether to count leap seconds (defaults to
* {@link DATE_COUNT_LEAP_SECONDS})
*
* @return array array of year, month, day, hour, minute, second
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function round(
$pn_precision,
$pn_day,
$pn_month,
$pn_year,
$pn_hour = 0,
$pn_minute = 0,
$pn_second = 0,
$pb_countleap = DATE_COUNT_LEAP_SECONDS
)
{
if ($pn_precision <= DATE_PRECISION_YEAR) {
$hn_month = 0;
$hn_day = 0;
$hn_hour = 0;
$hn_minute = 0;
$hn_second = 0;
if ($pn_precision < DATE_PRECISION_YEAR) {
$hn_year = round($pn_year, $pn_precision - DATE_PRECISION_YEAR);
} else {
// Check part-year:
//
$hn_midyear = (Date_Calc::firstDayOfYear($pn_year + 1) -
Date_Calc::firstDayOfYear($pn_year)) / 2;
if (($hn_days = Date_Calc::dayOfYear(
$pn_day,
$pn_month,
$pn_year
)) <=
$hn_midyear - 1) {
$hn_year = $pn_year;
} elseif ($hn_days >= $hn_midyear) {
// Round up:
//
$hn_year = $pn_year + 1;
} else {
// Take time into account:
//
$hn_partday = Date_Calc::secondsPastMidnight(
$pn_hour,
$pn_minute,
$pn_second
) /
86400;
if ($hn_partday >= $hn_midyear - $hn_days) {
// Round up:
//
$hn_year = $pn_year + 1;
} else {
$hn_year = $pn_year;
}
}
}
} elseif ($pn_precision == DATE_PRECISION_MONTH) {
$hn_year = $pn_year;
$hn_day = 0;
$hn_hour = 0;
$hn_minute = 0;
$hn_second = 0;
$hn_firstofmonth = Date_Calc::firstDayOfMonth($pn_month, $pn_year);
$hn_midmonth = (Date_Calc::lastDayOfMonth($pn_month, $pn_year) +
1 -
$hn_firstofmonth) / 2;
if (($hn_days = Date_Calc::dateToDays(
$pn_day,
$pn_month,
$pn_year
) -
$hn_firstofmonth) <= $hn_midmonth - 1) {
$hn_month = $pn_month;
} elseif ($hn_days >= $hn_midmonth) {
// Round up:
//
list($hn_year, $hn_month) = Date_Calc::nextMonth(
$pn_month,
$pn_year
);
} else {
// Take time into account:
//
$hn_partday = Date_Calc::secondsPastMidnight(
$pn_hour,
$pn_minute,
$pn_second
) /
86400;
if ($hn_partday >= $hn_midmonth - $hn_days) {
// Round up:
//
list($hn_year, $hn_month) = Date_Calc::nextMonth(
$pn_month,
$pn_year
);
} else {
$hn_month = $pn_month;
}
}
} elseif ($pn_precision == DATE_PRECISION_DAY) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_hour = 0;
$hn_minute = 0;
$hn_second = 0;
if (Date_Calc::secondsPastMidnight(
$pn_hour,
$pn_minute,
$pn_second
) >= 43200) {
// Round up:
//
list($hn_year, $hn_month, $hn_day) =
explode(" ", Date_Calc::nextDay(
$pn_day,
$pn_month,
$pn_year,
"%Y %m %d"
));
} else {
$hn_day = $pn_day;
}
} elseif ($pn_precision == DATE_PRECISION_HOUR) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
$hn_minute = 0;
$hn_second = 0;
if (Date_Calc::secondsPastTheHour($pn_minute, $pn_second) >= 1800) {
// Round up:
//
list($hn_year, $hn_month, $hn_day, $hn_hour) =
Date_Calc::addHours(
1,
$pn_day,
$pn_month,
$pn_year,
$pn_hour
);
} else {
$hn_hour = $pn_hour;
}
} elseif ($pn_precision <= DATE_PRECISION_MINUTE) {
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
$hn_hour = $pn_hour;
$hn_second = 0;
if ($pn_precision < DATE_PRECISION_MINUTE) {
$hn_minute = round(
$pn_minute,
$pn_precision - DATE_PRECISION_MINUTE
);
} else {
// Check seconds:
//
if ($pn_second >= 30) {
// Round up:
//
list($hn_year,
$hn_month,
$hn_day,
$hn_hour,
$hn_minute) =
Date_Calc::addMinutes(
1,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute
);
} else {
$hn_minute = $pn_minute;
}
}
} else {
// Precision is at least (DATE_PRECISION_SECOND - 1):
//
$hn_year = $pn_year;
$hn_month = $pn_month;
$hn_day = $pn_day;
$hn_hour = $pn_hour;
$hn_minute = $pn_minute;
$hn_second = round(
$pn_second,
$pn_precision - DATE_PRECISION_SECOND
);
if (fmod($hn_second, 1) == 0.0) {
$hn_second = (int)$hn_second;
if ($hn_second != intval($pn_second)) {
list($hn_year,
$hn_month,
$hn_day,
$hn_hour,
$hn_minute,
$hn_second) =
Date_Calc::addSeconds(
$hn_second - intval($pn_second),
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute,
intval($pn_second),
$pn_precision >=
DATE_PRECISION_SECOND &&
$pb_countleap
);
//
// (N.B. if rounded to nearest 10 seconds,
// user does not expect seconds to be '60')
}
}
}
return array((int)$hn_year,
(int)$hn_month,
(int)$hn_day,
(int)$hn_hour,
(int)$hn_minute,
$hn_second);
}
// }}}
// {{{ roundSeconds()
/**
* Rounds seconds up or down to the nearest specified unit
*
* @param int $pn_precision number of digits after the decimal point
* @param int $pn_day the day of the month
* @param int $pn_month the month
* @param int $pn_year the year
* @param int $pn_hour the hour
* @param int $pn_minute the minute
* @param mixed $pn_second the second as integer or float
* @param bool $pb_countleap whether to count leap seconds (defaults to
* DATE_COUNT_LEAP_SECONDS)
*
* @return array array of year, month, day, hour, minute, second
* @access public
* @static
* @since Method available since Release 1.5.0
*/
public function roundSeconds(
$pn_precision,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute,
$pn_second,
$pb_countleap = DATE_COUNT_LEAP_SECONDS
)
{
return Date_Calc::round(
DATE_PRECISION_SECOND + $pn_precision,
$pn_day,
$pn_month,
$pn_year,
$pn_hour,
$pn_minute,
$pn_second
);
}
// }}}
// {{{ isoWeekToDate()
/**
* Converts the Week number and Day-of-Week to Date
*
* Calculation algorithm taken from
* {@link http://www.merlyn.demon.co.uk/weekcalc.htm}.
*
* @param int $dow day of week from 1 (Monday) to 7 (Sunday)
* @param int $week number of week from 1 to 53
* @param int $year four digits of year
* @param string $format the output format
*
* @return string formatted date
* @access public
* @static
* @since Method available since Release 1.5.0a2
*/
public function isoWeekToDate($dow, $week, $year, $format = DATE_CALC_FORMAT)
{
// validates the week number
list(, $nweeks) = Date_Calc::isoWeekDate(28, 12, $year);
if ($week > $nweeks) {
return PEAR::raiseError(
"ISO week number for $year cannot be greater than $nweeks",
DATE_ERROR_INVALIDDATE
);
}
// validates the day of week
if ($dow < 1 || $dow > 7) {
return PEAR::raiseError(
"ISO day of week must be between 1 and 7",
DATE_ERROR_INVALIDDATE
);
}
// finds the day of week of January 4th.
$jan4th = Date_Calc::dayOfWeek(4, 1, $year);
if ($jan4th == 0) {
$jan4th = 7;
}
// offset to the monday of that week
$offset = -($jan4th - 1);
// increment the days starting from january 4th.
$days = Date_Calc::dateToDays(1, 1, $year) + $offset + 7 * ($week - 1) + ($dow - 1) + 3;
return Date_Calc::daysToDate($days, $format);
}
// }}}
}
// }}}
/*
* Local variables:
* mode: php
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
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