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How to calculate the difference between two times for the same day in hours

Posted on 2010-09-15
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Last Modified: 2013-11-11
I've been searching all over the web and can't quite find the solution to what I need. I would like to calculate the difference between two times formatted in military time in hours (with two decimal places). The start and end times will be entered as text into a form and the difference (or total time below) is needed as a value for import into our work ticket system. It will be assumed that the times entered will always be on the same date, so it may be useful to return an error if the end time is prior to the start time.

For example:

Start time: 10:00 (manually entered)
End time: 13:30 (manually entered)
Total time: 1.50 hours (calculated upon form submit)

Any help would be greatly appreciated. Thanks in advance!
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Question by:pwcit
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Accepted Solution

by:
Gurvinder Pal Singh earned 2000 total points
ID: 33689148
you can set the time into the date object using the following method

function parseIntoTime( inputStrTime )
{
   var times = inputStrTime.split(":");
   var date = new Date();
   date.setHours( parseInt(times[0]) );
   date.setMinutes( parseInt(times[1]) );
  return date;
}

function timeDifference()
{
   var inputTime1 = document.getElementById("textTime1").value;
   var inputTime2 = document.getElementById("textTime2").value;
   var noOfMS = parseIntoTime( inputTime2 ).getTime() - parseIntoTime( inputTime1 ).getTime();
   alert( "number of hours are: " + (noOfMS/(1000*60*60)) );
}
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LVL 14

Expert Comment

by:Dushyant Sharma
ID: 33689155
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