(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::setTime — Sets the time
public DateTimeImmutable::setTime ( int $hour , int $minute [, int $second = 0 [, int $microsecond = 0 ]] ) : DateTimeImmutable
Like DateTime::setTime() but works with DateTimeImmutable.
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https://www.php.net/manual/en/datetimeimmutable.settime.php