Here is an alphabetical list of PHP’s built-in 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 the 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 given year |
| easter_days() | Returns the number of days after March 21 on which Easter falls for a given year |
| frenchtojd() | Converts a date from the French Republican Calendar 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 Julian Day Count to Gregorian date |
| jdtojewish() | Converts a Julian day count to a Jewish calendar date |
| jdtojulian() | Converts a Julian Day Count to a Julian Calendar Date |
| jdtounix() | Converts Julian Day to Unix timestamp |
| jewishtojd() | Converts a date in the Jewish Calendar to Julian Day Count |
| juliantojd() | Converts a Julian Calendar date to Julian Day Count |
| unixtojd() | Converts Unix timestamp to Julian Day |