The DateTime::modify() function is an inbuilt function in PHP which is used to modify or can alter the timestamp of a DateTime object.
Syntax:
- Object oriented style:
DateTime DateTime::modify( string $modify )
- Procedural style:
DateTime date_modify( DateTime $object, string $modify )
Parameters: This function uses two parameters as mentioned above and described below:
- $object: It specifies the DateTime object returned by date_create() function. This object is modified by DateTime::modify() function.
- $modify: It specifies the date/time string. It is incremented or decremented to modify the DateTime object.
Return Value: This function returns the modified DateTime object on success or False on failure.
Below programs illustrate the DateTime::modify() function in PHP:
Program 1 :
<?php // PHP program to illustrate // DateTime::modify() function     // Creating a DateTime object $datetime = new DateTime('2019-09-30');   // Calling of date DateTime::modify() function // with the increment of 5 days as parameters $datetime->modify('+5 day');   // Getting the modified date in "y-m-d" format echo $datetime->format('Y-m-d');   ?> |
Output:
2019-10-05
Program 2:
<?php // PHP program to illustrate the // DateTime::modify() function     // Creating a DateTime object $datetime = new DateTime('2019-09-30');   // Calling of date DateTime::modify() function // with the increment of 5 months as parameters $datetime->modify('+5 month');   // Getting the modified date in "y-m-d" format echo $datetime->format('Y-m-d');   ?> |
Output:
2020-03-01
Reference: https://www.php.net/manual/en/datetime.modify.php
