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@ 2017-07-05T15:15:14Z

<?php

$cookieExpireDays = 28;

        $expires = (new \DateTime('now'))->add(new \DateInterval(sprintf('P%sD', $cookieExpireDays)));
        
        var_dump($expires);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
sprintf: documentation ( source)

preferences:dark modelive preview

35.98 ms | 402 KiB | 5 Q