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
date_add(DateTime $object, DateInterval $interval);
Example
Add 10 days to the specified date:
<?php
$date = new DateTime('2025-06-15');
$interval = new DateInterval('P10D');
date_add($date, $interval);
echo $date->format('Y-m-d');
?>
Code execution result:
'2025-06-25'
Example
Add 1 year and 2 months to the date:
<?php
$date = new DateTime('2025-03-20');
$interval = new DateInterval('P1Y2M');
date_add($date, $interval);
echo $date->format('Y-m-d');
?>
Code execution result:
'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
$date = date_create('2025-03-20');
$interval = new DateInterval('P1Y2M');
date_add($date, $interval);
echo date_format($date, 'Y-m-d');
?>
Code execution result:
'2026-05-20'
