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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) 1999-2006 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor
* 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>
* @copyright 1999-2006 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor
* @license http://www.opensource.org/licenses/bsd-license.php
* BSD License
* @version CVS: $Id: Calc.php,v 1.35 2006/11/21 23:01:13 firman Exp $
* @link http://pear.php.net/package/Date
* @since File available since Release 1.2
*/
// }}}
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');
}
// {{{ 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.
*
* @author Monte Ohrt <monte@ispi.net>
* @author Daniel Convissor <danielc@php.net>
* @copyright 1999-2006 Monte Ohrt, Pierre-Alain Joye, Daniel Convissor
* @license http://www.opensource.org/licenses/bsd-license.php
* BSD License
* @version Release: 1.4.7
* @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 strfmt()
*
* This function is used to alleviate the problem with 32-bit numbers for
* dates pre 1970 or post 2038, as strfmt() has on most systems.
* Most of the formatting options are compatible.
*
* Formatting options:
* <pre>
* %a abbreviated weekday name (Sun, Mon, Tue)
* %A full weekday name (Sunday, Monday, Tuesday)
* %b abbreviated month name (Jan, Feb, Mar)
* %B full month name (January, February, March)
* %d day of month (range 00 to 31)
* %e day of month, single digit (range 0 to 31)
* %E number of days since unspecified epoch (integer)
* (%E is useful for passing a date in a URL as
* an integer value. Then simply use
* daysToDate() to convert back to a date.)
* %j day of year (range 001 to 366)
* %m month as decimal number (range 1 to 12)
* %n newline character (\n)
* %t tab character (\t)
* %w weekday as decimal (0 = Sunday)
* %U week number of current year, first sunday as first week
* %y year as decimal (range 00 to 99)
* %Y year as decimal including century (range 0000 to 9999)
* %% literal '%'
* </pre>
*
* @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.
* Do not add leading 0's for years prior to 1000.
* @param string $format the format string
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function dateFormat($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':
$output .= Date_Calc::julianDate($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':
$output .= substr($year, 2, 2);
break;
case 'Y':
$output .= $year;
break;
case '%':
$output .= '%';
break;
default:
$output .= $char.$nextchar;
}
$strpos++;
} else {
$output .= $char;
}
}
return $output;
}
// }}}
// {{{ defaultCentury()
/**
* Turns a two digit year into a four digit year
*
* From '51 to '99 is in the 1900's, otherwise it's in the 2000's.
*
* @param int $year the 2 digit year
*
* @return string the 4 digit year
*
* @access public
* @static
*/
function defaultCentury($year)
{
if (strlen($year) == 1) {
$year = '0' . $year;
}
if ($year > 50) {
return '19' . $year;
} else {
return '20' . $year;
}
}
// }}}
// {{{ dateToDays()
/**
* Converts a date to number of days since a distant unspecified epoch
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return integer the number of days since the Date_Calc epoch
*
* @access public
* @static
*/
function dateToDays($day, $month, $year)
{
$century = (int)substr($year, 0, 2);
$year = (int)substr($year, 2, 2);
if ($month > 2) {
$month -= 3;
} else {
$month += 9;
if ($year) {
$year--;
} else {
$year = 99;
$century --;
}
}
return (floor((146097 * $century) / 4 ) +
floor((1461 * $year) / 4 ) +
floor((153 * $month + 2) / 5 ) +
$day + 1721119);
}
// }}}
// {{{ daysToDate()
/**
* Converts number of days to a distant unspecified epoch
*
* @param int $days the number of days since the Date_Calc epoch
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function daysToDate($days, $format = DATE_CALC_FORMAT)
{
$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);
if ($month < 10) {
$month +=3;
} else {
$month -=9;
if ($year++ == 99) {
$year = 0;
$century++;
}
}
$century = sprintf('%02d', $century);
$year = sprintf('%02d', $year);
return Date_Calc::dateFormat($day, $month, $century . $year, $format);
}
// }}}
// {{{ gregorianToISO()
/**
* Converts from Gregorian Year-Month-Day to ISO Year-WeekNumber-WeekDay
*
* Uses ISO 8601 definitions. Algorithm by Rick McCarty, 1999 at
* http://personal.ecu.edu/mccartyr/ISOwdALG.txt .
* Transcribed to PHP by Jesus M. Castagnetto.
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return string the date in ISO Year-WeekNumber-WeekDay format
*
* @access public
* @static
*/
function gregorianToISO($day, $month, $year)
{
$mnth = array (0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334);
$y_isleap = Date_Calc::isLeapYear($year);
$y_1_isleap = Date_Calc::isLeapYear($year - 1);
$day_of_year_number = $day + $mnth[$month - 1];
if ($y_isleap && $month > 2) {
$day_of_year_number++;
}
// find Jan 1 weekday (monday = 1, sunday = 7)
$yy = ($year - 1) % 100;
$c = ($year - 1) - $yy;
$g = $yy + intval($yy / 4);
$jan1_weekday = 1 + intval((((($c / 100) % 4) * 5) + $g) % 7);
// weekday for year-month-day
$h = $day_of_year_number + ($jan1_weekday - 1);
$weekday = 1 + intval(($h - 1) % 7);
// find if Y M D falls in YearNumber Y-1, WeekNumber 52 or
if ($day_of_year_number <= (8 - $jan1_weekday) && $jan1_weekday > 4){
$yearnumber = $year - 1;
if ($jan1_weekday == 5 || ($jan1_weekday == 6 && $y_1_isleap)) {
$weeknumber = 53;
} else {
$weeknumber = 52;
}
} else {
$yearnumber = $year;
}
// find if Y M D falls in YearNumber Y+1, WeekNumber 1
if ($yearnumber == $year) {
if ($y_isleap) {
$i = 366;
} else {
$i = 365;
}
if (($i - $day_of_year_number) < (4 - $weekday)) {
$yearnumber++;
$weeknumber = 1;
}
}
// find if Y M D falls in YearNumber Y, WeekNumber 1 through 53
if ($yearnumber == $year) {
$j = $day_of_year_number + (7 - $weekday) + ($jan1_weekday - 1);
$weeknumber = intval($j / 7);
if ($jan1_weekday > 4) {
$weeknumber--;
}
}
// put it all together
if ($weeknumber < 10) {
$weeknumber = '0'.$weeknumber;
}
return $yearnumber . '-' . $weeknumber . '-' . $weekday;
}
// }}}
// {{{ dateSeason()
/**
* Determines julian date of the given season
*
* Adapted from previous work in Java by James Mark Hamilton.
*
* @param string $season the season to get the date for: VERNALEQUINOX,
* SUMMERSOLSTICE, AUTUMNALEQUINOX,
* or WINTERSOLSTICE
* @param string $year the year in four digit format. Must be between
* -1000BC and 3000AD.
*
* @return float the julian date the season starts on
*
* @author James Mark Hamilton <mhamilton@qwest.net>
* @author Robert Butler <rob@maxwellcreek.org>
* @access public
* @static
*/
function dateSeason($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;
}
// }}}
// {{{ dateNow()
/**
* Returns the current local date
*
* NOTE: This function retrieves the local date using strftime(),
* which may or may not be 32-bit safe on your system.
*
* @param string $format the string indicating how to format the output
*
* @return string the current date in the specified format
*
* @access public
* @static
*/
function dateNow($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
*/
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
*/
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
*/
function getDay()
{
return Date_Calc::dateNow('%d');
}
// }}}
// {{{ julianDate()
/**
* Returns number of days since 31 December of year 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 $year the year in four digit format, default is current local year
*
* @return int the julian date for the date
*
* @access public
* @static
*/
function julianDate($day = 0, $month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$days = array(0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334);
$julian = ($days[$month - 1] + $day);
if ($month > 2 && Date_Calc::isLeapYear($year)) {
$julian++;
}
return $julian;
}
// }}}
// {{{ getWeekdayFullname()
/**
* Returns the full weekday name for the 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 $year the year in four digit format, default is current local year
*
* @return string the full name of the day of the week
*
* @access public
* @static
*/
function getWeekdayFullname($day = 0, $month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$weekday_names = Date_Calc::getWeekDays();
$weekday = Date_Calc::dayOfWeek($day, $month, $year);
return $weekday_names[$weekday];
}
// }}}
// {{{ getWeekdayAbbrname()
/**
* Returns the abbreviated weekday name for the 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 int $length the length of abbreviation
*
* @return string the abbreviated name of the day of the week
*
* @access public
* @static
* @see Date_Calc::getWeekdayFullname()
*/
function getWeekdayAbbrname($day = 0, $month = 0, $year = 0, $length = 3)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
return substr(Date_Calc::getWeekdayFullname($day, $month, $year),
0, $length);
}
// }}}
// {{{ getMonthFullname()
/**
* Returns the full month name for the given month
*
* @param int $month the month
*
* @return string the full name of the month
*
* @access public
* @static
*/
function getMonthFullname($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 $length the length of abbreviation
*
* @return string the abbreviated name of the month
*
* @access public
* @static
* @see Date_Calc::getMonthFullname
*/
function getMonthAbbrname($month, $length = 3)
{
$month = (int)$month;
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return substr(Date_Calc::getMonthFullname($month), 0, $length);
}
// }}}
// {{{ getMonthFromFullname()
/**
* Returns the numeric month from the month name or an abreviation
*
* Both August and Aug would return 8.
*
* @param string $month the name of the month to examine.
* Case insensitive.
*
* @return integer the month's number
*
* @access public
* @static
*/
function getMonthFromFullName($month)
{
$month = strtolower($month);
$months = Date_Calc::getMonthNames();
while(list($id, $name) = each($months)) {
if (ereg($month, strtolower($name))) {
return $id;
}
}
return 0;
}
// }}}
// {{{ 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 preformace
* hits when called more than once.
*
* @returns array an array of month names
*
* @access public
* @static
*/
function getMonthNames()
{
$months = array();
for ($i = 1; $i < 13; $i++) {
$months[$i] = strftime('%B', mktime(0, 0, 0, $i, 1, 2001));
}
return $months;
}
// }}}
// {{{ getWeekDays()
/**
* Returns an array of week days
*
* Used to take advantage of the setlocale function to
* return language specific week days.
*
* TODO: cache values to some global array to avoid preformace
* hits when called more than once.
*
* @returns array an array of week day names
*
* @access public
* @static
*/
function getWeekDays()
{
$weekdays = array();
for ($i = 0; $i < 7; $i++) {
$weekdays[$i] = strftime('%A', mktime(0, 0, 0, 1, $i, 2001));
}
return $weekdays;
}
// }}}
// {{{ dayOfWeek()
/**
* Returns day of week for given date (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 $year the year in four digit format, default is current local year
*
* @return int the number of the day in the week
*
* @access public
* @static
*/
function dayOfWeek($day = 0, $month = 0, $year = 0)
{
if (empty($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 -= 2;
} else {
$month += 10;
$year--;
}
$day = (floor((13 * $month - 1) / 5) +
$day + ($year % 100) +
floor(($year % 100) / 4) +
floor(($year / 100) / 4) - 2 *
floor($year / 100) + 77);
$weekday_number = $day - 7 * floor($day / 7);
return $weekday_number;
}
// }}}
// {{{ weekOfYear()
/**
* Returns week of the year, first Sunday is first day of first 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 $year the year in four digit format, default is current local year
*
* @return int the number of the week in the year
*
* @access public
* @static
*/
function weekOfYear($day = 0, $month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$iso = Date_Calc::gregorianToISO($day, $month, $year);
$parts = explode('-', $iso);
$week_number = intval($parts[1]);
return $week_number;
}
// }}}
// {{{ 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 $year the year in four digit format, default is current local year
*
* @return int the number of the quarter in the year
*
* @access public
* @static
*/
function quarterOfYear($day = 0, $month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$year_quarter = intval(($month - 1) / 3 + 1);
return $year_quarter;
}
// }}}
// {{{ daysInMonth()
/**
* Find the number of days in the given month
*
* @param int $month the month, default is current local month
* @param int $year the year in four digit format, default is current local year
*
* @return int the number of days the month has
*
* @access public
* @static
*/
function daysInMonth($month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if ($year == 1582 && $month == 10) {
return 21; // October 1582 only had 1st-4th and 15th-31st
}
if ($month == 2) {
if (Date_Calc::isLeapYear($year)) {
return 29;
} else {
return 28;
}
} elseif ($month == 4 or $month == 6 or $month == 9 or $month == 11) {
return 30;
} else {
return 31;
}
}
// }}}
// {{{ 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 $year the year in four digit format, default is current local year
*
* @return int the number of weeks the month has
*
* @access public
* @static
*/
function weeksInMonth($month = 0, $year = 0)
{
if (empty($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
*/
function getCalendarWeek($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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][$col]
*
* @access public
* @static
*/
function getCalendarMonth($month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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::dateToDays('01', $month, $year) - 6;
} else {
$curr_day = Date_Calc::dateToDays('01', $month, $year)
- Date_Calc::firstOfMonthWeekday($month, $year) + 1;
}
} else {
$curr_day = (Date_Calc::dateToDays('01', $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
*/
function getCalendarYear($year = 0, $format = DATE_CALC_FORMAT)
{
if (empty($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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function prevDay($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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, $year);
return Date_Calc::daysToDate($days - 1, $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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function nextDay($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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, $year);
return Date_Calc::daysToDate($days + 1, $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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function prevWeekday($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function nextWeekday($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($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);
}
// }}}
// {{{ prevDayOfWeek()
/**
* Returns date of the previous specific day of the week
* from the given date
*
* @param int day of 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 bool $onOrBefore if true and days are same, returns current day
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function prevDayOfWeek($dow, $day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT, $onOrBefore = false)
{
if (empty($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);
$curr_weekday = Date_Calc::dayOfWeek($day, $month, $year);
if ($curr_weekday == $dow) {
if (!$onOrBefore) {
$days -= 7;
}
} elseif ($curr_weekday < $dow) {
$days -= 7 - ($dow - $curr_weekday);
} else {
$days -= $curr_weekday - $dow;
}
return Date_Calc::daysToDate($days, $format);
}
// }}}
// {{{ 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 bool $onOrAfter if true and days are same, returns current day
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function nextDayOfWeek($dow, $day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT, $onOrAfter = false)
{
if (empty($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);
$curr_weekday = Date_Calc::dayOfWeek($day, $month, $year);
if ($curr_weekday == $dow) {
if (!$onOrAfter) {
$days += 7;
}
} elseif ($curr_weekday > $dow) {
$days += 7 - ($curr_weekday - $dow);
} else {
$days += $dow - $curr_weekday;
}
return Date_Calc::daysToDate($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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function prevDayOfWeekOnOrBefore($dow, $day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
return Date_Calc::prevDayOfWeek($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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function nextDayOfWeekOnOrAfter($dow, $day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
return Date_Calc::nextDayOfWeek($dow, $day, $month, $year, $format,
true);
}
// }}}
// {{{ beginOfWeek()
/**
* Find the month day of the beginning of week for given date,
* using 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function beginOfWeek($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$this_weekday = Date_Calc::dayOfWeek($day, $month, $year);
$interval = (7 - DATE_CALC_BEGIN_WEEKDAY + $this_weekday) % 7;
return Date_Calc::daysToDate(Date_Calc::dateToDays($day, $month, $year)
- $interval, $format);
}
// }}}
// {{{ endOfWeek()
/**
* Find the month day of the end of week for given date,
* using 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function endOfWeek($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$this_weekday = Date_Calc::dayOfWeek($day, $month, $year);
$interval = (6 + DATE_CALC_BEGIN_WEEKDAY - $this_weekday) % 7;
return Date_Calc::daysToDate(Date_Calc::dateToDays($day, $month, $year)
+ $interval, $format);
}
// }}}
// {{{ beginOfPrevWeek()
/**
* Find the month day of the beginning of week before given date,
* using 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function beginOfPrevWeek($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$date = Date_Calc::daysToDate(Date_Calc::dateToDays($day-7,
$month,
$year),
'%Y%m%d');
$prev_week_year = substr($date, 0, 4);
$prev_week_month = substr($date, 4, 2);
$prev_week_day = substr($date, 6, 2);
return Date_Calc::beginOfWeek($prev_week_day, $prev_week_month,
$prev_week_year, $format);
}
// }}}
// {{{ beginOfNextWeek()
/**
* Find the month day of the beginning of week after given date,
* using 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function beginOfNextWeek($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
$date = Date_Calc::daysToDate(Date_Calc::dateToDays($day + 7,
$month,
$year),
'%Y%m%d');
$next_week_year = substr($date, 0, 4);
$next_week_month = substr($date, 4, 2);
$next_week_day = substr($date, 6, 2);
return Date_Calc::beginOfWeek($next_week_day, $next_week_month,
$next_week_year, $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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
function beginOfMonth($month = 0, $year = 0, $format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::dateFormat('01', $month, $year, $format);
}
// }}}
// {{{ beginOfPrevMonth()
/**
* Returns date of the first day of previous month of 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
function beginOfPrevMonth($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
if ($month > 1) {
$month--;
$day = 1;
} else {
$year--;
$month = 12;
$day = 1;
}
return Date_Calc::dateFormat($day, $month, $year, $format);
}
// }}}
// {{{ endOfPrevMonth()
/**
* Returns date of the last day of previous month 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
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @see Date_Calc::endOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
function endOfPrevMonth($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
if ($month > 1) {
$month--;
} else {
$year--;
$month = 12;
}
$day = Date_Calc::daysInMonth($month, $year);
return Date_Calc::dateFormat($day, $month, $year, $format);
}
// }}}
// {{{ beginOfNextMonth()
/**
* Returns date of begin of next month of 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @see Date_Calc::beginOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
function beginOfNextMonth($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
if ($month < 12) {
$month++;
$day = 1;
} else {
$year++;
$month = 1;
$day = 1;
}
return Date_Calc::dateFormat($day, $month, $year, $format);
}
// }}}
// {{{ endOfNextMonth()
/**
* Returns date of the last day of next month of 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @see Date_Calc::endOfMonthBySpan()
* @deprecated Method deprecated in Release 1.4.4
*/
function endOfNextMonth($day = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if (empty($day)) {
$day = Date_Calc::dateNow('%d');
}
if ($month < 12) {
$month++;
} else {
$year++;
$month = 1;
}
$day = Date_Calc::daysInMonth($month, $year);
return Date_Calc::dateFormat($day, $month, $year, $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.
* 0 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @since Method available since Release 1.4.4
*/
function beginOfMonthBySpan($months = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if ($months > 0) {
// future month
$tmp_mo = $month + $months;
$month = $tmp_mo % 12;
if ($month == 0) {
$month = 12;
$year = $year + floor(($tmp_mo - 1) / 12);
} else {
$year = $year + floor($tmp_mo / 12);
}
} else {
// past or present month
$tmp_mo = $month + $months;
if ($tmp_mo > 0) {
// same year
$month = $tmp_mo;
} elseif ($tmp_mo == 0) {
// prior dec
$month = 12;
$year--;
} else {
// some time in a prior year
$month = 12 + ($tmp_mo % 12);
$year = $year + floor($tmp_mo / 12);
}
}
return Date_Calc::dateFormat(1, $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.
* 0 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 $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
* @since Method available since Release 1.4.4
*/
function endOfMonthBySpan($months = 0, $month = 0, $year = 0,
$format = DATE_CALC_FORMAT)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
if ($months > 0) {
// future month
$tmp_mo = $month + $months;
$month = $tmp_mo % 12;
if ($month == 0) {
$month = 12;
$year = $year + floor(($tmp_mo - 1) / 12);
} else {
$year = $year + floor($tmp_mo / 12);
}
} else {
// past or present month
$tmp_mo = $month + $months;
if ($tmp_mo > 0) {
// same year
$month = $tmp_mo;
} elseif ($tmp_mo == 0) {
// prior dec
$month = 12;
$year--;
} else {
// some time in a prior year
$month = 12 + ($tmp_mo % 12);
$year = $year + floor($tmp_mo / 12);
}
}
return Date_Calc::dateFormat(Date_Calc::daysInMonth($month, $year),
$month, $year, $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 $year the year in four digit format, default is current local year
*
* @return int number of weekday for the first day, 0=Sunday
*
* @access public
* @static
*/
function firstOfMonthWeekday($month = 0, $year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (empty($month)) {
$month = Date_Calc::dateNow('%m');
}
return Date_Calc::dayOfWeek('01', $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 = first, etc. 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.
* Do not add leading 0's for years prior to 1000.
* @param string $format the string indicating how to format the output
*
* @return string the date in the desired format
*
* @access public
* @static
*/
function NWeekdayOfMonth($week, $dow, $month, $year,
$format = DATE_CALC_FORMAT)
{
if (is_numeric($week)) {
$DOW1day = ($week - 1) * 7 + 1;
$DOW1 = Date_Calc::dayOfWeek($DOW1day, $month, $year);
$wdate = ($week - 1) * 7 + 1 + (7 + $dow - $DOW1) % 7;
if ($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
*
* @param int $day the day of the month
* @param int $month the month
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return boolean
*
* @access public
* @static
*/
function isValidDate($day, $month, $year)
{
if ($year < 0 || $year > 9999) {
return false;
}
if (!checkdate($month, $day, $year)) {
return false;
}
return true;
}
// }}}
// {{{ isLeapYear()
/**
* Returns true for a leap year, else false
*
* @param int $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return boolean
*
* @access public
* @static
*/
function isLeapYear($year = 0)
{
if (empty($year)) {
$year = Date_Calc::dateNow('%Y');
}
if (preg_match('/\D/', $year)) {
return false;
}
if ($year < 1000) {
return false;
}
if ($year < 1582) {
// pre Gregorio XIII - 1582
return ($year % 4 == 0);
} else {
// post Gregorio XIII - 1582
return (($year % 4 == 0) && ($year % 100 != 0)) || ($year % 400 == 0);
}
}
// }}}
// {{{ 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 $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return boolean
*
* @access public
* @static
*/
function isFutureDate($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 $year the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return boolean
*
* @access public
* @static
*/
function isPastDate($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.
* Do not add leading 0's for years prior to 1000.
* @param int $day2 the day of the month
* @param int $month2 the month
* @param int $year2 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return int the absolute number of days between the two dates.
* If an error occurs, -1 is returned.
*
* @access public
* @static
*/
function dateDiff($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.
* Do not add leading 0's for years prior to 1000.
* @param int $day2 the day of the month
* @param int $month2 the month
* @param int $year2 the year. Use the complete year instead of the
* abbreviated version. E.g. use 2005, not 05.
* Do not add leading 0's for years prior to 1000.
*
* @return int 0 if the dates are equal. 1 if date 1 is later, -1 if
* date 1 is earlier.
*
* @access public
* @static
*/
function compareDates($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;
}
// }}}
}
// }}}
/*
* Local variables:
* mode: php
* tab-width: 4
* c-basic-offset: 4
* c-hanging-comment-ender-p: nil
* End:
*/
?>
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