(PHP 5 >= 5.5.0, PHP 7)
DateTimeImmutable::modify — Creates a new object with modified timestamp
public DateTimeImmutable::modify ( string $modifier ) : DateTimeImmutable|false
Creates a new DateTimeImmutable object with modified timestamp. The original object is not modified.
object
Procedural style only: A DateTime object returned by date_create(). The function modifies this object.
modifier
A date/time string. Valid formats are explained in Date and Time Formats.
Returns the newly created object or false on failure.
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https://www.php.net/manual/en/datetimeimmutable.modify.php