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

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

(PHP 5 >= 5.2.0, PHP 7) Sets the time public

(PHP 5 >= 5.2.0, PHP 7) Returns date formatted according to given format

(PHP 5 >= 5.2.0, PHP 7) Returns new DateTime object

(PHP 5 >= 5.1.2, PHP 7) Returns an array with information about sunset/sunrise and twilight begin/end

(PHP 5 >= 5.5.0, PHP 7) Subtracts an amount of days, months, years, hours, minutes and seconds

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

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

(PHP 5 >= 5.3.0, PHP 7) Returns the difference between two DateTime objects