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

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

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Converts from a supported calendar to Julian Day Count

(PHP 5 >= 5.2.0, PHP 7) Sets the ISO date

(PHP 4, PHP 5, PHP 7) Converts a Julian Day Count to a Julian Calendar Date

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

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

(PHP 5 >= 5.3.0, PHP 7) Gets the Unix timestamp

(PHP 5 >= 5.2.0, PHP 7) Returns associative array with detailed info about given date

(PHP 5 >= 5.5.0, PHP 7) Creates a new object with modified timestamp