« DateTimeImmutable::setTimestamp DateTimeImmutable::sub » PHP Manual DateTimeImmutable Sets the time zone DateTimeImmutable::setTimezone (PHP 5 >= 5.5.0, PHP 7) DateTimeImmutable::setTimezone — Sets the time zone 说明 public DateTimeImmutable::setTimezone ( DateTimeZone $timezone ) : DateTimeImmutable Like DateTime::setTimezone() but works with DateTimeImmutable.