PHP round the time to the nearest 15 seconds

Question

This is not a duplicate question, but involves a little understanding about time.

I need a solution to the following problem I have a number of specifically produced tim

Answer 1

Convert the date to seconds using strtotime and then just work in seconds.

$seconds = strtotime($date);
$seconds /= 15;
$seconds = round($seconds);
$seconds *= 15;
$date = date("Y-m-d H:i:s", $seconds);