The DateTimeImmutable::modify() function is an inbuilt function in PHP which is used to modify or alter the timestamp of the created DateTimeImmutable object. Syntax:

DateTimeImmutable DateTimeImmutable::modify( string $modify )

Parameters: This function uses two parameters as mentioned above and described below:

• object: This parameter holds the DateTime object returned by date_create() function.
• $modify This parameter holds the date/time string which is set of times to alter the given DataTimeImmutable object.

Return Values: This function returns the modified DateTimeImmutable object on success or False on failure. Below programs illustrate the DateTimeImmutable::modify() function in PHP: Program 1: This program modify the given date with the increment of 5 days.

 

<?php

// PHP program to illustrate DateTimeImmutable::modify()

// function

// creating a DateTime object

$datetimeImmutable = new DateTimeImmutable('2019-10-02T00:00:00');

​

// Calling of date DateTimeImmutable::modify() function

// with the increment of 5 days as parameters

$newDateTimeImmutable = $datetimeImmutable->modify('+5 days');

​

// Getting the modified date in "y-m-d" format

echo $newDateTimeImmutable->format('Y-m-d');

?>

Program 2: This program modify the given date with the increment of 2 months.

 

<?php

// PHP program to illustrate DateTimeImmutable::modify()

// function

// Creating a DateTime object

$datetimeImmutable = new DateTimeImmutable('2019-10-02T00:00:00');

​

// Calling of date DateTimeImmutable::modify() function

// with the increment of 2 months as parameters

$newDateTimeImmutable = $datetimeImmutable->modify('+2 months');

​

// Getting the modified date in "y-m-d" format

echo $newDateTimeImmutable->format('Y-m-d');

?>

Reference: https://www.php.net/manual/en/datetimeimmutable.modify.php