Time different jquery

   let start = $('.baseRosterStartTime').val();

    let end = $('.baseRosterEndTime').val();  

    s = start.split(':');

    e = end.split(':');

    min = e[1]-s[1];

    hour_carry = 0;

    if(min < 0){

        min += 60;

        hour_carry += 1;

    }

    hour = e[0]-s[0]-hour_carry;

    min = ((min/60)*100).toString()

    diff = hour + ":" + min.substring(0,2);

    $('.totalhours').val(diff);