If you use the diff command, you will be able to see the difference between the files as shown below:

diff file1 file2

diff -y file1 file2 -W 120 #View side by side

This function will find the difference between two given times. Does PHP already have a native function for that?

//The difference between 2 given time
function dateDifference($day_1,$day_2) {
	$diff = strtotime($day_1) - strtotime($day_2);

	$sec   = $diff % 60;
	$diff  = intval($diff / 60);
	$min   = $diff % 60;
	$diff  = intval($diff / 60);
	$hours = $diff % 24;
	$days  = intval($diff / 24);

	return array($sec,$min,$hours,$days);
}

If you just want the day difference…

$diff = strtotime($day_1) - strtotime($day_2) + 1; //Find the number of seconds
$day_difference = ceil($diff / (60*60*24)) ;  //Find how many days that is

This can be done using the DATEDIFF function in MySQL 5

[tags]php,code,date,difference,time[/tags]