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<DateTimeDateTime::__construct>
^DateTimeLast updated: Mon, 26 Oct 2026

DateTime::add

date_add

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

DateTime::add -- date_add — Modifies a DateTime object, with added amount of days, months, years, hours, minutes and seconds

Description

Object-oriented style

public function DateTime::add(DateInterval $interval): DateTime

Procedural style

function date_add(DateTime $object, DateInterval $interval): DateTime

Adds the specified DateInterval object to the specified DateTime object.

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

The procedural version takes the DateTime object as its first argument.

Parameters

object

Procedural style only: A DateTime object returned by date_create(). The function modifies this object.

interval

A DateInterval object

Return Values

Returns the modified DateTime object for method chaining.

See Also


<DateTimeDateTime::__construct>
^DateTimeLast updated: Mon, 26 Oct 2026