PHP - Adding an interval to dates and getting the difference not working

Question

I want to have a countdown for how long until something expires, but it's not working. Specially, using the diff function of datetime returns essentially a dateinterval of nothing (all 0s). Here's the code:

    $created = new DateTime("2012-11-20");
    $expires = $created;
    $expires->add(new DateInterval("P14D")); //adds a week
    $timeLeft = $created->diff($expires);
    echo $timeLeft->format('%a days');

The problem is this code returns 0 days always..

Baba · Accepted Answer · 2012-12-14 09:35:51Z

4

The main issue is how you are copying the object, you need to clone the object instead .. replace

$expires = $created;

With

$expires = clone $created;

Full Code

$created = new DateTime("2012-11-20");
$expires = clone $created;
$expires->add(new DateInterval("P14D")); //adds 14 days
$timeLeft = $created->diff($expires);
echo $timeLeft->format('%a days');

Output

14 days

See Live Demo

edited Dec 14, 2012 at 9:35

answered Dec 2, 2012 at 21:56

Baba

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