Calculate Time Difference with JavaScript

Question

I have two HTML input boxes, that need to calculate the time difference in JavaScript onBlur (since I need it in real time) and insert the result to new input box.

F

Answer 1

   calTimeDifference(){
    this.start = dailyattendance.InTime.split(":");
    this.end = dailyattendance.OutTime.split(":");
    var time1 = ((parseInt(this.start[0]) * 60) + parseInt(this.start[1]))
    var time2 = ((parseInt(this.end[0]) * 60) + parseInt(this.end[1]));
    var time3 = ((time2 - time1) / 60);
    var timeHr = parseInt(""+time3);
    var  timeMin = ((time2 - time1) % 60);
}