Calculating time Difference with Submission Pre-Parser

[ramonbps]

So i got it working, this is what i did below. I hope this helps!.

PHP Code:

// Set Time Zone
date_default_timezone_set('America/Los_Angeles');
//Get Checkin
$tcheckin = $_POST["checkin"];
//Get Checkout
$tcheckout = $_POST["checkout"];
//Create Time Variable from checkin
$dteStart = new DateTime($tcheckin);
//Create Time Variable from checkout
$dteEnd   = new DateTime($tcheckout);
// Calculate Time Difference
$dteDiff  = $dteStart->diff($dteEnd);
//Format Time
$ttdiff = $dteDiff->format("%H:%I");
//Insert Time Differance to Total
$_POST["inandout"]=["$ttdiff"];