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PHP Calendar Functions


PHP Calendar Introduction

The calendar extension contains functions that simplifies converting between different calendar formats.

It is based on the Julian Day Count, which is a count of days starting from January 1st, 4713 B.C.

Note: To convert between calendar formats, you must first convert to Julian Day Count, then to the calendar of your choice.

Note: The Julian Day Count is not the same as the Julian Calendar!


Installation

For these functions to work, you have to compile PHP with --enable-calendar.

The Windows version of PHP has built-in support for this extension.


PHP Calendar Functions

Function Description
cal_days_in_month() Returns the number of days in a month for a specified year and calendar
cal_from_jd() Converts a Julian Day Count into a date of a specified calendar
cal_info() Returns information about a specified calendar
cal_to_jd() Converts a date in a specified calendar to Julian Day Count
easter_date() Returns the Unix timestamp for midnight on Easter of a specified year
easter_days() Returns the number of days after March 21, that the Easter Day is in a specified year
frenchtojd() Converts a French Republican date to a Julian Day Count
gregoriantojd() Converts a Gregorian date to a Julian Day Count
jddayofweek() Returns the day of the week
jdmonthname() Returns a month name
jdtofrench() Converts a Julian Day Count to a French Republican date
jdtogregorian() Converts a Julian Day Count to a Gregorian date
jdtojewish() Converts a Julian Day Count to a Jewish date
jdtojulian() Converts a Julian Day Count to a Julian date
jdtounix() Converts Julian Day Count to Unix timestamp
jewishtojd() Converts a Jewish date to a Julian Day Count
juliantojd() Converts a Julian date to a Julian Day Count
unixtojd() Converts Unix timestamp to Julian Day Count


PHP Predefined Calendar Constants

Constant Type PHP Version
CAL_GREGORIAN Integer PHP 4
CAL_JULIAN Integer PHP 4
CAL_JEWISH Integer PHP 4
CAL_FRENCH Integer PHP 4
CAL_NUM_CALS Integer PHP 4
CAL_DOW_DAYNO Integer PHP 4
CAL_DOW_SHORT Integer PHP 4
CAL_DOW_LONG Integer PHP 4
CAL_MONTH_GREGORIAN_SHORT Integer PHP 4
CAL_MONTH_GREGORIAN_LONG Integer PHP 4
CAL_MONTH_JULIAN_SHORT Integer PHP 4
CAL_MONTH_JULIAN_LONG Integer PHP 4
CAL_MONTH_JEWISH Integer PHP 4
CAL_MONTH_FRENCH Integer PHP 4
CAL_EASTER_DEFAULT Integer PHP 4.3
CAL_EASTER_ROMAN Integer PHP 4.3
CAL_EASTER_ALWAYS_GREGORIAN Integer PHP 4.3
CAL_EASTER_ALWAYS_JULIAN Integer PHP 4.3
CAL_JEWISH_ADD_ALAFIM_GERESH Integer PHP 5.0
CAL_JEWISH_ADD_ALAFIM Integer PHP 5.0
CAL_JEWISH_ADD_GERESHAYIM Integer PHP 5.0