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I have multiple submission forms that need to calculate total hours based on the begin time and end time entered. The script I have entered is: <script> document.getElementById('Submit').onmouseover = function(){ var date = document.getElementById('InsertRecordDate_of_Service').value; if(date == "") date = "1/1/2011"; var hour = document.getElementById('cbParamVirtual2').value; if(hour =="") hour="00"; var minute = document.getElementById('cbParamVirtual3').value; if(minute == "") minute = "00"; var ampm = document.getElementById('cbParamVirtual4').value; document.getElementById('InsertRecordStart_Time').value = date + " " + hour + ":" + minute + " " + ampm; var hour2 = document.getElementById('cbParamVirtual6').value; if(hour2 =="") hour2="00"; var minute2 = document.getElementById('cbParamVirtual8').value; if(minute2 == "") minute2 = "00"; var ampm2 = document.getElementById('cbParamVirtual7').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('InsertRecordTotal_Units').value = totalmin.toFixed(2); }; </script> This is working some of the time, but not always, and I don't know what the problem is. I just submitted a record for 6/9/15 11:00 AM to 6/9/15 2:00 PM, and it came up with 185.00 hours. Does anyone know a way to make this work?