DateInterval to prepare definite date and time for use in date time calculations in PHP

$date = new DateTime("2024-10-01");
$interval = new DateInterval("P1M"); // 1 month

$date->add($interval); // Adds 1 month
echo $date->format('Y-m-d'); // Output: 2024-11-01

DateInterval can be used to create a new dateinterval object for our date calculation and uses in any script. In the advance PHP object oriented style for all date & time calculations this format is useful. To specify we have to use some standards which are listed here. The period designations are single character.

Y  Year
M Month 
D days
H hours
I minutes
S seconds

The total specification has to start with P and then with an integer value followed by a period designator. All time part has to start with T.
Example : 4 days can be specified as P4D. Here are some more examples of datetime interval specifications

P7D : 7 days
P1Y1M  :  One year and one month
P1Y1M2D : One year, one month and 2 Days

We need to keep the sequence as Year Month and Date , we can't keep at Month Year Date or any other way as we wish.

P1Y2D1M : This is wrong sequence

Same way we can add time also to the sequence , let us try with time only, then we will add both date and time to the sequence

PT1H : Adds one hour to the present time 
PT1H5M : Adds one hour 5 minutes to the present time
PT1H5M10S : Adds one hour 5 minutes 10 seconds

Here also we have to maintain the sequence as Hour Minute and seconds .

PT1M5H10S

This will generate error as we have followed Minutes , Hour and second format. Let us combine date and time both and create an interval object

P1Y2M5DT1H5M10S

This will set an interval of 1 Year , 2 Months, 5 Days , 1 Hour, 5 Minutes, 10 Seconds

Adding date interval to date object

We will try to add the above interval to a new date object. Here is the php script.

$date = new DateTime('2012-02-01 13:25:50');
echo $date->format('Y-m-d H:i:s') . "<br>";
$date->add(new DateInterval('P1Y2M5DT1H5M10S'));
echo $date->format('Y-m-d H:i:s') . "\n";

The output of above code is here

2012-02-01 13:25:50
2013-04-06 14:31:00

Using today's date

In above code replace the first line.

$date = new DateTime(); // Todays date

Output ( Refresh this page and see the changes )

2027-11-14 18:01:48

PHP Date Functions Date Difference Timestamp in PHP Displaying calendar for selection of date by user Formatting the date interval in date and time

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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DateInterval : represents a duration of time between two dates or time

Adding date interval to date object

Using today's date

Subhendu Mohapatra