The calendar extension contains functions that simplify conversion between different calendar formats.
It is based on the Julian Day Count, which began on January 1, 4713 BC.
Note: To convert between calendar formats, you must first convert to Julian Day Count and then to the calendar format you require.
Note: Julian Day Count and Julian Calendar are not the same thing!
In order for these functions to work, you must compile PHP with --enable-calendar.
The Windows version of PHP has built-in support for calendar extensions. Therefore, the Calendar function works automatically.
| function | describe |
|---|---|
| cal_days_in_month() | Returns the number of days in a month for the specified year and calendar. |
| cal_from_jd() | Converts a Julian day count to a date in the specified calendar. |
| cal_info() | Returns information about the specified calendar. |
| cal_to_jd() | Converts a date in the specified calendar to Julian day counts. |
| easter_date() | Returns the Unix timestamp of Easter midnight in the specified year. |
| easter_days() | Returns the number of days between Easter and March 21 in the specified year. |
| frenchtojd() | Convert French Republican calendar dates to Julian day counts. |
| gregoriantojd() | Convert Gregorian calendar dates to Julian day counts. |
| jddayofweek() | The day of the week the return date falls on. |
| jdmonthname() | Returns the name of the month. |
| jdtofrench() | Converts Julian day counts to French Republican calendar dates. |
| jdtogregorian() | Converts Julian day counts to Gregorian calendar dates. |
| jdtojewish() | Converts Julian day counts to Jewish calendar dates. |
| jdtojulian() | Converts Julian day counts to Julian calendar dates. |
| jdtounix() | Convert Julian day count to Unix timestamp. |
| jewishtojd() | Convert Jewish calendar dates to Julian day counts. |
| juliantojd() | Converts a Julian calendar date to a Julian day count. |
| unixtojd() | Convert Unix timestamp to Julian day count. |
| 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 |