(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::setTimestamp — Sets the date and time based on a Unix timestamp
public DateTimeImmutable::setTimestamp ( int $timestamp ) : DateTimeImmutable
Like DateTime::setTimestamp() but works with DateTimeImmutable.
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https://www.php.net/manual/en/datetimeimmutable.settimestamp.php