The add Method of The DateTime Class

The add method of the DateTime class adds a specified time interval to a date. The method accepts one parameter - an object of DateInterval, which defines the time period to be added.

Syntax

php$datetime->add(DateInterval $interval);

Example

Add 1 day to the current date:

php<?php
  $date = new DateTime('2023-01-01');
  $interval = new DateInterval('P1D');
  $date->add($interval);
  echo $date->format('Y-m-d');
?>

Code execution result:

php'2023-01-02'

Example

Add 1 month, 2 days, and 4 hours to the specified date:

php<?php
  $date = new DateTime('2023-01-01 12:00:00');
  $interval = new DateInterval('P1M2DT4H');
  $date->add($interval);
  echo $date->format('Y-m-d H:i:s');
?>

Code execution result:

php'2023-02-03 16:00:00'

See Also