(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::setTimezone — Sets the time zone
public DateTimeImmutable::setTimezone ( DateTimeZone $timezone ) : DateTimeImmutable
Like DateTime::setTimezone() but works with DateTimeImmutable.
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https://www.php.net/manual/en/datetimeimmutable.settimezone.php