PHP Manual Function Reference Date and Time Related Extensions Date/Time DateTimeImmutable DateTimeImmutable::setTimestamp DateTimeImmutable::setTime DateTimeImmutable::setTimezone DateTimeImmutable::setTimestamp (PHP 5 >= 5.5.0)DateTimeImmutable::setTimestamp — Sets the date and time based on an Unix timestamp Description public DateTimeImmutable DateTimeImmutable::setTimestamp ( int $unixtimestamp ) Like DateTime::setTimestamp() but works with DateTimeImmutable.