Adding 12 months to February 29

Question

I want to add 12 months to my date. My start date is 02/29/2020 and I want to add 12 months to this.

Code:

$startdate = '02/29/2020';
date('m/d/Y', strtotime('+12 months', strtotime($startdate)));

Output:

03/01/2021

I used this code to add 12 months but the output is 03/01/2021, when the real output should be 02/28/2020.

Answer 1

Have a look!

 function add_months($months, DateTime $dateObject) 
   {
        $next = new DateTime($dateObject->format('Y-m-d'));
        $next->modify('last day of +'.$months.' month');

        if($dateObject->format('d') > $next->format('d')) {
            return $dateObject->diff($next);
        } else {
            return new DateInterval('P'.$months.'M');
        }
    }

function getCalculatedDate($d1, $months)
{
    $date = new DateTime($d1);

    // call second function to add the months
    $newDate = $date->add(add_months($months, $date));

    //formats final date to m/d/Y form
    $dateReturned = $newDate->format('m/d/Y'); 

    return $dateReturned;
}

An example would be:-

$startDate = '02/29/2020';
$nMonths = 12; // choose how many months you want to add
$finalDate = getCalculatedDate($startDate, $nMonths); // output: 02/28/2021

This way you will get the output of 02/28/2021