The date_add Function

The date_add function adds a time interval to a date object. The first parameter accepts a DateTime object, the second - a DateInterval object.

Syntax

phpdate_add(DateTime $object, DateInterval $interval);

Example

Add 10 days to the specified date:

php<?php
  $date = new DateTime('2025-06-15');
  $interval = new DateInterval('P10D');
  
  date_add($date, $interval);
  echo $date->format('Y-m-d');
?>

Code execution result:

php'2025-06-25'

Example

Add 1 year and 2 months to the date:

php<?php
  $date = new DateTime('2025-03-20');
  $interval = new DateInterval('P1Y2M');
  
  date_add($date, $interval);
  echo $date->format('Y-m-d');
?>

Code execution result:

php'2026-05-20'

Example

The date_create function returns a DateTime object. You can rewrite the code in a mixed style, partially OOP and partially functional:

php<?php
  $date = date_create('2025-03-20');
  $interval = new DateInterval('P1Y2M');
  
  date_add($date, $interval);
  echo date_format($date, 'Y-m-d');
?>

Code execution result:

php'2026-05-20'

See Also