(PHP 5 >= 5.3.0, PHP 7) Sets the date and time based on an Unix timestamp

(PHP 5 >= 5.5.0, PHP 7) Returns new DateTimeImmutable object

(PHP 5 >= 5.2.0, PHP 7) Returns the timezone offset from GMT

(PHP 5 >= 5.2.0, PHP 7) Returns a numerically indexed array containing all defined timezone identifiers

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

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

(PECL hrtime >= 0.4.3) Get elapsed time for the last interval.

(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 5 >= 5.2.0, PHP 7) Alters the timestamp