The calendar extension presents a series of functions to simplify converting between different calendar formats.
The intermediary or standard it is based on is the Julian Day Count. The Julian Day Count is a count of days starting from January 1st, 4713 B.C. To convert between calendar systems, you must first convert to Julian Day Count, then to the calendar system of your choice.
Installation:
To get these functions to work, you have to compile PHP with --enable-calendar.
Runtime Configuration:
This extension has no configuration directives defined in php.ini.
PHP Calendar Constants:
| 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 |
List of 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 |
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