PHP Calendar Functions

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PHP Calendar Introduction

The calendar functions are useful when working with different calendar formats. The standard it is based on is the Julian day count (Julian day count is a count of days starting from January 1, 4713 B.C.). Note: Julian day count is not the same as the Julian calendar

Note: To convert between calendar formats, you must first convert to Julian day count, then to the calendar format.

Installation

The windows version of PHP has built-in support for the calendar extension. So, the calendar functions will work automatically.

However, if you are running the Linux version of PHP, you will have to compile PHP with --enable-calendar to get the calendar functions to work.

PHP Calendar Functions

PHP: indicates the earliest version of PHP that supports the function.

Function Description PHP
cal_days_in_month() Returns the number of days in a month for a specified year and calendar 4
cal_from_jd() Converts a Julian day count into a date of a specified calendar 4
cal_info() Returns information about a given calendar 4
cal_to_jd() Converts a date to Julian day count 4
easter_date() Returns the Unix timestamp for midnight on Easter of a specified year 3
easter_days() Returns the number of days after March 21, on which Easter falls for a specified year 3
FrenchToJD() Converts a French Republican date to a Julian day count 3
GregorianToJD() Converts a Gregorian date to a Julian day count 3
JDDayOfWeek() Returns the day of a week 3
JDMonthName() Returns a month name 3
JDToFrench() Converts a Julian day count to a French Republican date 3
JDToGregorian() Converts a Julian day count to a Gregorian date 3
jdtojewish() Converts a Julian day count to a Jewish date 3
JDToJulian() Converts a Julian day count to a Julian date 3
jdtounix() Converts a Julian day count to a Unix timestamp 4
JewishToJD() Converts a Jewish date to a Julian day count 3
JulianToJD() Converts a Julian date to a Julian day count 3
unixtojd() Converts a Unix timestamp to a Julian day count 4

PHP Calendar Constants

PHP: indicates the earliest version of PHP that supports the constant.

Constant Description PHP
CAL_GREGORIAN Gregorian calendar 3
CAL_JULIAN Julian calendar 3
CAL_JEWISH Jewish calendar 3
CAL_FRENCH French Republican calendar 3
CAL_NUM_CALS   3
CAL_DOW_DAYNO   3
CAL_DOW_SHORT   3
CAL_DOW_LONG   3
CAL_MONTH_GREGORIAN_SHORT   3
CAL_MONTH_GREGORIAN_LONG   3
CAL_MONTH_JULIAN_SHORT   3
CAL_MONTH_JULIAN_LONG   3
CAL_MONTH_JEWISH   3
CAL_MONTH_FRENCH   3
CAL_EASTER_DEFAULT   4
CAL_EASTER_DEFAULT   4
CAL_EASTER_ROMAN   4
CAL_EASTER_ALWAYS_GREGORIAN   4
CAL_EASTER_ALWAYS_JULIAN   4
CAL_JEWISH_ADD_ALAFIM_GERESH   5
CAL_JEWISH_ADD_ALAFIM   5
CAL_JEWISH_ADD_GERESHAYIM   5

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