PHP
(quick guide & examples)
SET DEFAULT TIMEZONE IN PHP.INI date.timezone = "Asia/Bangkok"
GET SYSTEM TIMEZONE IN SCRIPTS echo date_default_timezone_get();
SET SYSTEM TIMEZONE IN SCRIPTS date_default_timezone_set ("Asia/Tokyo");
DEFAULTS TO SYSTEM TIMEZONE $dt = new DateTime();
GET TIMEZONE & DATE WITH TIMEZONE echo $dt->getTimezone()->getName(); echo $dt->format("d/M/Y H:i:s O");
SET TIMEZONE $dt = new DateTime( "2019-08-07 06:00:00", new DateTimeZone("Asia/Tokyo") );
CHANGE TIMEZONE $dt->setTimezone(new DateTimeZone("Antarctica/Troll"));