- strtotime: documentation ( source)
<?php
function dateCompare($a, $b)
{
$t1 = strtotime($a);
$t2 = strtotime($b);
return $t1 - $t2;
}
print dateCompare('2013-12-02', '2013-12-06').'\r\n';
print dateCompare('2013-12-02', '2013-12-06')/(60*60*24);
print 60*60*24;