timezone_open Returns new DateTimeZone object &reftitle.description; DateTimeZonetimezone_open stringtimezone DateTimeZoneDateTimeZone::__construct stringtimezone &reftitle.parameters; timezone Time zone identifier as full name (e.g. Europe/Prague) or abbreviation (e.g. CET). &reftitle.returnvalues; Returns DateTimeZone object on success or &false; on failure.