(PHP 5 >= 5.3.0, PHP 7) Gets the version of the timezonedb

(PHP 5 >= 5.3.0, PHP 7) Returns the warnings and errors

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

(PECL hrtime >= 0.4.3) Get elapsed ticks for all intervals.

(PHP 4, PHP 5, PHP 7) Format a GMT/UTC date/time

(PHP 5 >= 5.1.0, PHP 7) Sets the default timezone used by all date/time functions in a script

(PECL hrtime >= 0.4.3) Timer frequency in ticks per second

(PHP 5 >= 5.2.0, PHP 7) Return time zone relative to given DateTime

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

(PHP 5 >= 5.5.0, PHP 7) Sets the ISO date