DateTimeImmutable::add

(PHP 5 >= 5.5.0, PHP 7)

DateTimeImmutable::add Adds an amount of days, months, years, hours, minutes and seconds

Description

public DateTimeImmutable::add ( DateInterval $interval ) : DateTimeImmutable

Like DateTime::add() but works with DateTimeImmutable.

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https://www.php.net/manual/en/datetimeimmutable.add.php