PHP | DateTimeImmutable modify() Function

Last Updated : 10 Oct, 2019
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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
// 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');
?>
Output: 
2019-10-07
Program 2: This program modify the given date with the increment of 2 months. php 
<?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');
?>
Output: 
2019-12-02
Reference: https://www.php.net/manual/en/datetimeimmutable.modify.php

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PHP | DateTimeImmutable::sub() Function

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