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PHP | DateTime sub() Function

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The DateTime::sub() function is an inbuilt function in PHP which is used to subtract a number of days, months, years, hours, minutes and seconds from a created DateTime object. Syntax:
  • Object oriented style:
    DateTime DateTime::sub( DateInterval interval )
  • Procedural style:
    DateTime date_sub( DateTime $object, DateInterval $interval )
Parameters: This function uses two parameters as mentioned above and described below:
  • $object: This parameter holds the DateTime object created by date_create() function.
  • $interval: This parameter holds the DateInterval object.
Return Values: This function returns the DateTime object after subtraction is done on success or False on failure. Below programs illustrate the DateTime::sub() function in PHP: Program 1: This program uses DateTime::sub() function to subtract 2 days from given date object.
<?php
  
// PHP program to illustrate DateTime::sub()
// function
    
// Creating a new DateTime() object
$datetime = new DateTime('2019-10-03');
  
// Initialising a interval of 2 days
$interval = 'P2D';
  
// Calling the sub() function
$datetime->sub(new DateInterval($interval));
  
// Getting a new date time
// format of 'Y-m-d'
echo $datetime->format('Y-m-d');
?>

                    
Output:
2019-10-01
Program 2: This program uses DateTime::sub() function to subtract the given interval from date object.
<?php
// PHP program to illustrate DateTime::sub()
// function
  
// Creating a new DateTime() object
$datetime = new DateTime('2019-10-03');
  
// Initialising an interval
$interval = 'P2Y5M2DT0H30M40S';
  
// Calling the sub() function
$datetime->sub(new DateInterval($interval));
  
// Getting a new date time
// format of 'Y-m-d H:i:s'
echo $datetime->format('Y-m-d H:i:s');
  
?>

                    
Output:
2017-04-30 23:29:20
Reference: https://www.php.net/manual/en/datetime.sub.php

Last Updated : 10 Oct, 2019
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