string to time code example

Example 1: convert string to date php

$s = '08/11/2010 19:37:02';
$date = strtotime($s);
echo date('Y-m-d H:i:s', $date);

Example 2: php start of day epoch

$beginOfDay = strtotime("today", $timestamp);
$endOfDay   = strtotime("tomorrow", $beginOfDay) - 1;