Fetch timestamp of the midnight before a given timestamp

Question

Given any unix-timestamp T, I want to fetch the timestamp of the midnight before T.

The given timestamp can be any integer: now, today, (not too far[]) in the future or (not too far[]) in the past.

Is there a cleaner way then (pseudocode):

<?php
$midnight = strtotime("{date('d',$ts)}-{date('m',$ts)}-{date('Y', $ts)} midnight");
?>

Thanks.

[*] somewhere between 1990 and 2020.

Answer 1

I would do it as

$midnight = strtotime(date('Y-m-d',$ts).' 00:00:00');

...but whether that is cleaner/better is debatable...