Hello everyone!

I have the following code that will count the elapsed time and print the value in seconds after the user hits the stop button. However we are trying to get it to post the elapsed time in hours. So lets say the elapsed time is 20 mintues, the output would be .3 hours. I appreciate any help or tips you can give me.

Code JavaScript:
<script type="text/javascript">
 
// Javascript to compute elapsed time between "Start" and "Finish" button clicks
function timestamp_class(this_current_time, this_start_time, this_end_time, this_time_difference) { 
        this.this_current_time = this_current_time;
        this.this_start_time = this_start_time;
        this.this_end_time = this_end_time;
        this.this_time_difference = this_time_difference;
        this.GetCurrentTime = GetCurrentTime;
        this.StartTiming = StartTiming;
        this.EndTiming = EndTiming;
    }
 
    //Get current time from date timestamp
    function GetCurrentTime() {
    var my_current_timestamp;
        my_current_timestamp = new Date();              //stamp current date & time
        return my_current_timestamp.getTime();
        }
 
    //Stamp current time as start time and reset display textbox
    function StartTiming() {
        this.this_start_time = GetCurrentTime();        //stamp current time
        document.TimeDisplayForm.TimeDisplayBox.value = 0;      //init textbox display to zero
        }
 
    //Stamp current time as stop time, compute elapsed time difference and display in textbox
    function EndTiming() {
        this.this_end_time = GetCurrentTime();          //stamp current time
        this.this_time_difference = (this.this_end_time - this.this_start_time) / 1000; //compute elapsed time
        document.TimeDisplayForm.TimeDisplayBox.value = this.this_time_difference;      //set elapsed time in display box
        }
 
var time_object = new timestamp_class(0, 0, 0, 0);  //create new time object and initialize it
 
//-->
</script>
 
    <form>
        <input type="button" value="Start" onClick="time_object.StartTiming()"; name="StartButton">
    </form>
    <form>
        <input type="button" value="Finish" onClick="time_object.EndTiming()"; name="EndButton">
    </form>
    <form name="TimeDisplayForm">
    Elapsed time:
      <input type="text" name="TimeDisplayBox" size="6">
    seconds
    </form>