(PHP 4, PHP 5, PHP 7) Convert Julian Day to Unix timestamp

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Returns information about a particular calendar

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Return the number of days in a month for a given year and calendar

(PHP 4, PHP 5, PHP 7) Returns the day of the week

(PHP 4, PHP 5, PHP 7) Convert Unix timestamp to Julian Day

(PHP 4, PHP 5, PHP 7) Converts a date in the Jewish Calendar to Julian Day Count

(PHP 4, PHP 5, PHP 7) Get Unix timestamp for midnight on Easter of a given year

(PHP 4, PHP 5, PHP 7) Converts a date from the French Republican Calendar to a Julian Day Count