PHP Manual Function Reference Date and Time Related Extensions Date/Time DateTimeImmutable DateTimeImmutable::setTimezone DateTimeImmutable::setTimestamp DateTimeImmutable::sub DateTimeImmutable::setTimezone (PHP 5 >= 5.5.0)DateTimeImmutable::setTimezone — Sets the time zone Description public DateTimeImmutable DateTimeImmutable::setTimezone ( DateTimeZone $timezone ) Like DateTime::setTimezone() but works with DateTimeImmutable.