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vlibDate.php
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<?php
// +------------------------------------------------------------------------+
// | PHP version 5.x, tested with 5.1.4, 5.1.6, 5.2.6 |
// +------------------------------------------------------------------------+
// | Copyright (c) 2002-2008 Kelvin Jones, Claus van Beek, Stefan Deussen |
// +------------------------------------------------------------------------+
// | Authors: Kelvin Jones, Claus van Beek, Stefan Deussen |
// +------------------------------------------------------------------------+
// | Artistic License 2.0 |
// +------------------------------------------------------------------------+
namespace clausvb\vlib;
// check to avoid multiple including of class
if (!defined('vlibDateClassLoaded'))
{
define('vlibDateClassLoaded', 1);
include_once(dirname(__FILE__) . '/vlibDate/error.php');
include_once (dirname(__FILE__) . '/vlibIni.php');
/**
* vlibDate is a class for manipulating dates (not times).
* There are 2 main uses for this class:
*
* 1) to handle dates outside of the normal date range of 32-bit systems.
* this can be handy for handling Dates of Birth for example.
*
* 2) to easily handle dates in different languages.
* vlibDate has several supported languages and the possibility to
* handle as many as submitted, so if you would like a language
* added, see CONTRIBUTE.txt
*
* For more information see the vlibDate.html in the 'docs' directory.
*
* @since 2002-04-02
* @package vLIB
* @access public
**/
class vlibDate
{
/*-----------------------------------------------------------------------------\
| ATTENTION |
| Do not touch the following variables. vlibDate will not work otherwise. |
\-----------------------------------------------------------------------------*/
/** contains the list of language specific weekdays */
var $days = array();
/** if abbreviations are not a substring of the weekday i.e. in Portuguese*/
var $daysabbr = array();
/** contains the list of language specific months */
var $months = array();
/** contains the list of suffixes */
var $suffixes = array();
/** a list of possible languages. */
var $accepted_langs = array('en', 'fr', 'de', 'es', 'pt', 'nl', 'it', 'no', 'sv', 'da', 'fi', 'ro', 'ar', 'ru');
/*-----------------------------------------------------------------------------\
| public functions |
\-----------------------------------------------------------------------------*/
/** FUNCTION: formatDate
*
* Formats the date like strftime(), but can handle dates from year 0001 - 9999
* and can display dates in different languages.
*
* formatting options:
*
* %a abbreviated weekday name according to the current language setting (Mon, Tue..)
* %A full weekday name according to the current language setting (Sunday, Monday, Tuesday...)
* %b abbreviated month name according to the current (Jan, Feb, Mar)
* %B full month name according to the current (January, February, March)
* %d day of the month as a decimal number (range 01 to 31)
* %e day of the month as a decimal number (range 0 to 31)
* %E number of days since unspecified epoch (integer)
* (%E is useful for storing a date in a Db/Session ..etc as an integer value.
* Then use daysToDate() to convert back to a date.)
* %j day of the year as a decimal number (range 001 to 366)
* %m month as decimal number (range 01 to 12)
* %n newline character
* %s ordinal suffix for day of month
* %t tab character
* %U week number of current year as a decimal number, starting with the first
* Sunday as the first day of the first week.
* %w weekday as decimal (0 = Sunday)
* %y year as a decimal number without a century (range 00 to 99)
* %Y year as a decimal number including the century (range 0000 to 9999)
* %% literal '%'
*
* @param string $timestamp vlibDate timestamp
* @param string $format for returned string
* @return string date in $format
* @access public
**/
function formatDate($timestamp, $format)
{
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow('%Y');
if (empty($month)) $month = $this->_dateNow('%m');
if (empty($day)) $day = $this->_dateNow('%d');
$output = '';
for ($strpos = 0; $strpos < mb_strlen($format); $strpos++)
{
$char = substr($format, $strpos, 1);
if ($char == '%')
{
$nextchar = substr($format, $strpos + 1, 1);
switch ($nextchar)
{
case 'a':
$output .= $this->getWeekdayAbbrname($timestamp);
break;
case 'A':
$output .= $this->getWeekdayFullname($timestamp);
break;
case 'b':
$output .= $this->getMonthAbbrname($timestamp);
break;
case 'B':
$output .= $this->getMonthFullname($timestamp);
break;
case 'd':
$output .= sprintf('%02d', $day);
break;
case 'e':
$output .= sprintf('%01d', $day);
break;
case 'E':
$output .= $this->dateToDays($timestamp);
break;
case 'j':
$output .= $this->julianDate($timestamp);
break;
case 'm':
$output .= sprintf('%02d', $month);
break;
case 'n':
$output .= "\n";
break;
case 's':
$output .= $this->getSuffix($timestamp);
break;
case 't':
$output .= "\t";
break;
case 'U':
$output .= $this->weekOfYear($timestamp);
break;
case 'w':
$output .= $this->dayOfWeek($timestamp);
break;
case 'W':
$output .= $this->weekOfYear($timestamp, TRUE);
break;
case 'y':
$output .= substr($year, 2, 2);
break;
case 'Y':
$output .= $year;
break;
case '%':
$output .= '%';
break;
default:
$output .= $char.$nextchar;
} // end switch
$strpos++;
}
else
{
$output .= $char;
}
}
return $output;
}
/** FUNCTION: getMonthFullname
*
* Returns the full month name for the vlibDate $timestamp.
*
* @param string $timestamp vlibDate timestamp
* @return string full month name
* @access public
*/
function getMonthFullname($timestamp)
{
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($month)) $month = $this->_dateNow("%m");
return $this->months[($month - 1)];
}
/** FUNCTION: getMonthAbbrname
*
* Returns the abbreviated month name for the vlibDate $timestamp.
*
* @param string $timestamp vlibDate timestamp
* @param int length of abbreviation, default=3
* @return string abbreviated month name
* @access public
*/
function getMonthAbbrname ($timestamp, $length=3) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($month)) $month = $this->_dateNow("%m");
return substr($this->months[($month - 1)],0, $length);
}
/** FUNCTION: getWeekdayFullname
*
* Returns the full weekday name for the vlibDate $timestamp.
*
* @param string $timestamp vlibDate timestamp
* @return string full weekday name
* @access public
*/
function getWeekdayFullname ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$weekday = $this->dayOfWeek("$year-$month-$day");
return $this->days[$weekday];
}
/** FUNCTION: getWeekdayAbbrname
*
* Returns the abbreviated weekday name for the vlibDate $timestamp.
*
* @param string $timestamp vlibDate timestamp
* @param int length of abbreviation, default=3
* @return string abbreviated weekday name
* @access public
*/
function getWeekdayAbbrname ($timestamp, $length=3) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$weekday = $this->dayOfWeek("$year-$month-$day");
if (!empty($this->daysabbr)) {
return ($this->daysabbr[$weekday]);
}
else {
return substr($this->days[$weekday],0, $length);
}
}
/** FUNCTION: now
*
* returns a vlibDate timestamp for the current day.
*
* @return string vlibDate timestamp
* @access public
*/
function now () {
return $this->_dateNow('%Y-%m-%d');
}
/** FUNCTION: getSuffix
*
* returns the suffix for the day of the month, i.e. 03 = rd (in english)
*
* @param string $timestamp vlibDate timestamp
* @param string suffix
* @access public
*/
function getSuffix ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($day)) $day = $this->_dateNow("%e");
return $this->suffixes[($day - 1)];
}
/** FUNCTION: mkTimestamp
*
* given the day, month and year of a date will return a vlibDate timestamp.
*
* @param string $year in YYYY format
* @param string $month in MM format
* @param string $day in DD format
* @return string vlibDate timestamp
* @access public
*/
function mkTimestamp ($year="", $month="", $day="") {
if(empty($year)) $year = $this->_dateNow("%Y");
if(empty($month)) $month = $this->_dateNow("%m");
if(empty($day)) $day = $this->_dateNow("%d");
return "$year-$month-$day";
}
/** FUNCTION: fromUnixTime
*
* returns a vlibDate timestamp from a given unix timestamp.
*
* @param int $unixtime
* @return string vlibDate timestamp
* @access public
*/
function fromUnixTime ($unixtime) {
return strftime('%Y-%m-%d', $unixtime);
}
/** FUNCTION: setLang
*
* sets the current language to the language specified by $lang.
* For a list of supported languages and there language codes, see
* the vlibDate.html file in the 'docs' directory.
*
* @param string $lang language code of language.
* @access public
*/
function setLang ($lang='en') {
if (in_array($lang, $this->accepted_langs)) {
require (dirname(__FILE__).'/vlibDate/langrefs_'.$lang.'.php');
$this->days = $days;
$this->daysabbr = $daysabbr;
$this->months = $months;
$this->suffixes = $suffixes;
}
else { // raise error
vlibDateError::raiseError('VD_ERROR_INVALID_LANG', FATAL);
}
}
/** FUNCTION: addInterval
*
* this function adds a specified interval to the specified timestamp.
* allowed intervals are DAY[S], WEEK[S], MONTH[S], YEAR[S]
* and CENTURY [CENTURIES].
* example of usage:
* $date = new vlibDate ('en');
* $now = $date->now();
* $nextweek = $date->addInterval($now, '1 WEEK');
* $nextweeknextyear = $date->addInterval($now, '1 WEEK 1 YEAR');
*
* you can use any combination of intervals.
*
* @param string $timestamp vlibDate timestamp
* @param string $interval desired interval
* @return string vlibDate timestamp
* @access public
*/
function addInterval ($timestamp, $interval) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
// these vars hold the temporary values as we calculate
$this->_day = $day;
$this->_month = $month;
$this->_year = $year;
$this->_interval = 0;
$this->_days = $this->dateToDays ($timestamp);
preg_replace("/([\d]+)\s*([\w]+)/xSe"
,"\$this->_calcAddInterval('\\1', '\\2');"
, $interval);
if ($this->_interval < 1) return $timestamp;
$days = $this->_days + $this->_interval;
return $this->daysToDate ($days);
}
/** FUNCTION: subInterval
*
* this function subtracts a specified interval from the specified timestamp.
* allowed intervals are DAY[S], WEEK[S], MONTH[S], YEAR[S]
* and CENTURY [CENTURIES].
* example of usage:
* $date = new vlibDate ('en');
* $now = $date->now();
* $lastweek = $date->subInterval($now, '1 WEEK');
* $lastweeklastyear = $date->subInterval($now, '1 WEEK 1 YEAR');
*
* you can use any combination of intervals.
*
* @param string $timestamp vlibDate timestamp
* @param string $interval desired interval
* @return string vlibDate timestamp
* @access public
*/
function subInterval ($timestamp, $interval) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
// these vars hold the temporary values as we calculate
$this->_day = $day;
$this->_month = $month;
$this->_year = $year;
$this->_interval = 0;
$this->_days = $this->dateToDays ($timestamp);
preg_replace("/([\d]+)\s*([\w]+)/xSe"
,"\$this->_calcSubInterval('\\1', '\\2');"
, $interval);
if ($this->_interval < 1) return $timestamp;
$days = $this->_days - $this->_interval;
return $this->daysToDate ($days);
}
/** FUNCTION: nextDay
*
* Returns a vlibDate timestamp for the day after $timestamp.
* If format is specified, then that format is returned instead
* of the timestamp.
*
* @param string $timestamp vlibDate timestamp
* @param string $format for returned date
* @return string if date in given format or vlibDate timestamp
* @access public
*/
function nextDay ($timestamp, $format="%Y-%m-%d") {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$days = $this->dateToDays("$year-$month-$day");
return ($this->daysToDate($days + 1, $format));
}
/** FUNCTION: prevDay
*
* Returns a vlibDate timestamp for the day before $timestamp.
* If format is specified, the that format is returned instead
* of the timestamp.
*
* @param string $timestamp vlibDate timestamp
* @param string $format for returned date
* @return string if date in given format or vlibDate timestamp
* @access public
*/
function prevDay($timestamp, $format="%Y-%m-%d")
{
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$days = $this->dateToDays("$year-$month-$day");
return ($this->daysToDate($days - 1, $format));
}
/** FUNCTION: isFutureDate
*
* Returns TRUE if the timestamp is in the future.
*
* @param string $timestamp vlibDate timestamp
* @return boolean TRUE/FALSE
* @access public
*/
function isFutureDate($timestamp)
{
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
$this_year = $this->_dateNow("%Y");
$this_month = $this->_dateNow("%m");
$this_day = $this->_dateNow("%d");
if ($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;
}
/** FUNCTION: isPastDate
*
* Returns TRUE if the timestamp is in the past.
*
* @param string $timestamp vlibDate timestamp
* @return boolean TRUE/FALSE
* @access public
*/
function isPastDate ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
$this_year = $this->_dateNow("%Y");
$this_month = $this->_dateNow("%m");
$this_day = $this->_dateNow("%d");
if ($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;
}
/** FUNCTION: isDate
*
* Returns TRUE if the timestamp is valid, FALSE otherwise.
*
* @param string $timestamp vlibDate timestamp
* @return boolean TRUE/FALSE
* @access public
*/
function isDate ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year) || empty($month) || empty($day)) return FALSE;
if ($year < 0 || $year > 9999) {
return FALSE;
}
if ($month < 1 || $month > 12) {
return FALSE;
}
if ($day < 1 || $day > $this->daysInMonth($month, $year)) {
return FALSE;
}
return TRUE;
}
/** FUNCTION: isLeapYear
*
* Returns TRUE if $year is a leap year.
*
* @param string $year in format YYYY or a vlibDate timestamp
* @return boolean TRUE/FALSE
* @access public
*/
function isLeapYear ($year="") {
if (mb_strlen($year) > 4) { // timestamp has bee parsed
list ($day, $month, $year) = array_values($this->_breakTimestamp($year));
}
elseif (mb_strlen($year) == 2) {
$year = $this->getLongYear($year);
}
elseif (empty($year)) {
$year = $this->_dateNow("%Y");
}
if (preg_match("/\D/", $year)) return FALSE;
return (($year % 4 == 0 && $year % 100 != 0) || $year % 400 == 0);
}
/** FUNCTION: dayOfWeek
*
* Returns day of week for the timestamp: 0=Sunday ... 6=Saturday
*
* @param string $timestamp vlibDate timestamp
* @return int $weekday_number
* @access public
*/
function dayOfWeek ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
if ($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;
}
/** FUNCTION: weekOfYear
*
* Returns week of the year.
* If $start_monday is TRUE, then the first week of the Year starts with the first
* Monday of the year, otherwise it's the first Sunday.
*
* @param string $timestamp vlibDate timestamp
* @param bool $start_monday
* @return integer $week_number
* @access public
*/
function weekOfYear ($timestamp, $start_monday=FALSE) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$week_year = $year - 1501;
$capt_days = ($start_monday) ? 29873 : 29872;
$week_day = $week_year * 365 + floor($week_year / 4) - $capt_days + 1
- floor($week_year / 100) + floor(($week_year - 300) / 400);
$week_number = floor(($this->julianDate("$year-$month-$day") + floor(($week_day + 4) % 7)) / 7);
return $week_number;
}
/** FUNCTION: julianDate
*
* Returns number of days since (and including) 1st January of the year
* in the given timestamp.
*
* @param string $timestamp vlibDate timestamp
* @return int $julian
* @access public
*/
function julianDate ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$days = array(0,31,59,90,120,151,181,212,243,273,304,334);
$julian = ($days[$month - 1] + $day);
if ($month > 2 && $this->isLeapYear($year)) $julian++;
return ($julian);
}
/** FUNCTION: quarterOfYear
*
* Returns quarter of the year for given timestamp.
*
* @param string $timestamp vlibDate timestamp
* @return int $year_quarter
* @access public
*/
function quarterOfYear ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
if (empty($day)) $day = $this->_dateNow("%d");
$year_quarter = (intval(($month - 1) / 3 + 1));
return $year_quarter;
}
/** FUNCTION: getLongYear
*
* Returns the year in YYYY format for the given year in YY format.
* 0-49 is considered 21st century, 50-99 is 20th century.
*
* @param string $year in YY format
* @return string year in YYYY format
* @access public
*/
function getLongYear ($year) {
if (mb_strlen($year) == 1) return ("200$year");
if ($year > 50) {
return ("19$year");
}
else {
return ("20$year");
}
}
/** FUNCTION: diffInDays
*
* Returns number of days between two given dates.
*
* @param string $timestamp1 vlibDate timestamp
* @param string $timestamp2 vlibDate timestamp
* @return int absolute number of days between dates, or FALSE on error
* @access public
*/
function diffInDays ($timestamp1, $timestamp2) {
if (!$this->isDate($timestamp1)) return FALSE;
if (!$this->isDate($timestamp2)) return FALSE;
return (abs(($this->dateToDays($timestamp1)) - ($this->dateToDays($timestamp2))));
}
/** FUNCTION: daysInMonth
*
* Find the number of days in the $month.
*
* @param mixed int month in MM format or a string vlibDate timestamp
* @param string year in YYYY format
* @return int number of days
* @access public
*/
function daysInMonth ($month="", $year="") {
if (mb_strlen($month) > 2) { // timestamp has bee parsed
list ($day, $month, $year) = array_values($this->_breakTimestamp($month));
}
else {
if (empty($year)) $year = $this->_dateNow("%Y");
if (empty($month)) $month = $this->_dateNow("%m");
}
$months = array (31,28,31,30,31,30,31,31,30,31,30,31);
$days = $months[($month-1)];
return (($month == 2 && $this->isLeapYear($year)) ? ($days+1) : $days);
}
/** FUNCTION: dateToDays
*
* Converts a vlibDate timestamp to a number of days since a long
* distant epoch.
* You can use this to store dates or to pass dates from 1
* URL to another.
*
* @param string $timestamp vlibDate timestamp
* @return int number of days
* @access public
*/
function dateToDays ($timestamp) {
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
$century = substr($year,0,2);
$year = substr($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 ) +
$day + 1721119);
}
/** FUNCTION: encodeDate
*
* alias for dateToDays().
*
*/
function encodeDate ($timestamp) {
return $this->dateToDays($timestamp);
}
/** FUNCTION: daysToDate
*
* Converts a number of days since a long distant epoch
* to a vlibDate timestamp or to a format specified by $format.
*
* @param int $days days since long distant epoch
* @return string vlibDate timestamp or other $format
* @access public
*/
function daysToDate ($days, $format="%Y-%m-%d")
{
$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);
$month = sprintf("%02d", $month);
$day = sprintf("%02d", $day);
return ($this->formatDate("$century$year-$month-$day", $format));
}
/** FUNCTION: decodeDate
*
* alias for daysToDate().
*
*/
function decodeDate ($days, $format="%Y-%m-%d") {
return $this->daysToDate($days, $format);
}
/** FUNCTION: getYear
*
* Returns the current year in YYYY format
*
* @return string year in YYYY format
* @access public
*/
function getYear () {
return $this->_dateNow("%Y");
}
/** FUNCTION: getMonth
*
* Returns the current month in MM format
*
* @return string month in MM format
* @access public
*/
function getMonth () {
return $this->_dateNow("%m");
}
/** FUNCTION: getDay
*
* Returns the current day in DD format
*
* @return string day in DD format
* @access public
*/
function getDay () {
return $this->_dateNow("%d");
}
/*-----------------------------------------------------------------------------\
| private functions |
\-----------------------------------------------------------------------------*/
/** FUNCTION: _calcSubInterval
*
* does the calculations for $this->subInterval();
*
* @param int $number number of $interval's
* @param string $interval type of interval, i.e. DAY, MONTH ...etc.
* @access private
*/
function _calcSubInterval ($number, $interval) {
$interval = strtoupper($interval);
if (substr($interval, -1, 1)=='S') $interval = substr($interval, 0, -1);
/* retreive the timestamp with the interval added so we can keep track
of the current year and month of calculation */
$timestamp = $this->daysToDate (($this->_days - $this->_interval));
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
switch ($interval) {
case 'DAY':
if ($number > 0) {
$this->_interval += $number;
}
break;
case 'WEEK':
if ($number > 0) {
$this->_interval += ($number*7);
}
break;
case 'MONTH':
if ($number > 0) {
for ($i=0; $i < $number; $i++) {
// first we goto prev month
if ($month != 1) {
$month--;
}
else {
$month = 12;
$year--;
}
$sub = $this->daysInMonth($month, $year);
$this->_interval += $sub;
}
}
break;
case 'CENTURIE':
$interval = 'CENTURY';
case 'CENTURY':
$interval = 'YEAR';
$number *= 100;
case 'YEAR':
if ($number > 0) {
for ($i=0; $i < $number; $i++) {
if (
($month < 3 && $this->isLeapYear(($year-1))) or
($month > 2 && $this->isLeapYear($year))
) {
$this->_interval += 366;
}
else {
$this->_interval += 365;
}
$year--; // goto previous year
}
}
break;
}
return;
}
/** FUNCTION: _calcAddInterval
*
* does the calculations for $this->addInterval();
*
* @param int $number number of $interval's
* @param string $interval type of interval, i.e. DAY, MONTH ...etc.
* @access private
*/
function _calcAddInterval ($number, $interval) {
$interval = strtoupper($interval);
if (substr($interval, -1, 1)=='S') $interval = substr($interval, 0, -1);
/* retreive the timestamp with the interval added so we can keep track
of the current year and month of calculation */
$timestamp = $this->daysToDate (($this->_days + $this->_interval));
list ($day, $month, $year) = array_values($this->_breakTimestamp($timestamp));
switch ($interval) {
case 'DAY':
if ($number > 0) {
$this->_interval += $number;
}
break;
case 'WEEK':
if ($number > 0) {
$this->_interval += ($number*7);
}
break;
case 'MONTH':
if ($number > 0) {
for ($i=0; $i < $number; $i++) {
$add = $this->daysInMonth($month, $year);
$this->_interval += $add;
if ($month < 12) {
$month++;
}
else {
$month = 1;
$year++;
}
}
}
break;
case 'CENTURIE':
$interval = 'CENTURY';
case 'CENTURY':
$interval = 'YEAR';
$number *= 100;
case 'YEAR':
if ($number > 0) {
for ($i=0; $i < $number; $i++) {