(PHP 5 >= 5.2.0, PHP 7) Alias of

(PHP 4, PHP 5, PHP 7) Converts a Gregorian date to Julian Day Count

(PHP 5 >= 5.3.0, PHP 7) Alias of

(PHP 4, PHP 5, PHP 7) Converts Julian Day Count to Gregorian date

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

(PHP 4, PHP 5, PHP 7) Get date/time information

(PHP 5 >= 5.1.0, PHP 7) Parse a time/date generated with

(PHP 4, PHP 5, PHP 7) Parse about any English textual datetime description into a Unix timestamp

(PHP 5 >= 5.2.0, PHP 7) Returns all transitions for the timezone

(PHP 4, PHP 5, PHP 7) Return current Unix timestamp with microseconds