DateTimeImmutable
PHP Manual

DateTimeImmutable::sub

(PHP 5 >= 5.5.0)

DateTimeImmutable::sub Subtracts an amount of days, months, years, hours, minutes and seconds

说明

public DateTimeImmutable DateTimeImmutable::sub ( DateInterval $interval )

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


DateTimeImmutable
PHP Manual