PHP 5 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.
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 5 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 5 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 |
