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Blocking Time Entries Over 12 Hours

Question

I have a time sheet submission page where users enter their start and end times, and the system calculates their total hours. I'm trying to find a way to block them from entering spans of time greater than 12 hours because this is usually an error in AM/PM selection. I'm hoping to have a pop-up that tells them there is an error they need to fix before they can submit it. Is there a way to do this? Below is what I have in my footer to calculate the time:

<script>

document.getElementById('Submit').onmouseover = function(){

var date = document.getElementById('InsertRecordDate').value;
if(date == "")
date = "1/1/2011";
var hour = document.getElementById('cbParamVirtual1').value;
if(hour =="")
hour="00";
var minute = document.getElementById('cbParamVirtual2').value;
if(minute == "")
minute = "00";
var ampm = document.getElementById('cbParamVirtual3').value;

document.getElementById('InsertRecordStart_Time').value = date + " " + hour + ":" + minute + " " + ampm;


var hour2 = document.getElementById('cbParamVirtual4').value;

if(hour2 =="")

hour2="00";

var minute2 = document.getElementById('cbParamVirtual5').value;

if(minute2 == "")

minute2 = "00";

var ampm2 = document.getElementById('cbParamVirtual6').value;

document.getElementById('InsertRecordEnd_Time').value = date + " " + hour2 + ":" + minute2 + " " + ampm2;
var start= new Date(document.getElementById('InsertRecordStart_Time').value);
var end = new Date(document.getElementById('InsertRecordEnd_Time').value);
var timeDiff = end - start;
var hh = Math.floor(timeDiff / 1000 / 60 / 60);

timeDiff -= hh * 1000 * 60 * 60;

var mm = Math.floor(timeDiff / 1000 / 60);

var totalmin= (mm+ (hh * 60)) ;
document.getElementById('InsertRecordHours').value =  (totalmin/60).toFixed(2);

};


</script>

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