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');

?>

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');

​

?>

Reference: https://www.php.net/manual/en/datetime.sub.php