PHP date_add() Function Usage and Examples

PHP Date & Time Functions Manual

The date_add() function adds a certain amount of days, months, years, hours, minutes, and seconds to a DateTime object.

Definition and Usage

The date_add() function is an alias of DateTime::add(). It takes a DateTime object as a parameter and a DateInterval object, and adds the specified interval to the given DateTime.

Syntax

date_add($object, $interval)

Parameters

Return value

The PHP date_add() function returns a DateTime object with the added interval. If it fails, this function will return a boolean valuefalse.

PHP version

This function was initially introduced in PHP version5.3introduced in version 5.2.0 and is available in all higher versions.

Online example

The following example demonstratesdate_add()Usage of the function-

<?php
　　　//Create a DateTime object
　　　$date　=　date_create("25-09-1989);
　　　//Adding interval to the date
　　　$res　=　date_add($date,　new　DateInterval('PT10H30S'));　　　
　　　//Format the date and print it
　　　$format　=　date_format(　$res,　"d-m-Y　H:i:s");
　　　print($format);
?>

Output result

25-09-1989　10:00:30

Online example

You can usedate_interval_create_from_date_string()The function creates an interval. The following example uses this function to create an interval and add it to a date:

<?php
　　　$date　=　date_create("2019-09-09);
　　　$interval　=　date_interval_create_from_date_string('30　days');
　　　$res　=　date_add($date,　$interval);　　　
　　　$format　=　date_format(　$res,　"Y-m-d　H:i:s");
　　　print($format);　　　
?>

Output result

2019-10-09　00:00:00

Online example

Now, let's try to add an interval with year, month, and day-

<?php
　　　//Create a DateTime object
　　　$date　=　date_create("25-09-1989);
　　　//Add time interval to the date
　　　$res　=　date_add($date,　new　DateInterval('P29Y2M5D'));　　　
　　　//Format the date and print it
　　　$format　=　date_format(　$res,　"Y-m-d");
　　　print($format);
?>

Output result

2018-11-30

Online example

on the date1995-05-07is added to150 days:

<?php
　　　$date　=　date_create('1995-05-07);
　　　$interval　=　date_interval_create_from_date_string('150　days');
　　　$date->add($interval);
　　　>print($date　->　format('Y-m-d'));
?>

This results in the following-

1995-10-04