add hh:mm to hh:mm to get new hh:mm then return new date

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Javascript

 this.returnDateTime = ko.computed(function() {
var selectedHr,selectedMin,jd,day,hr,min;
       if (self.startTime().split(" ")[1] === "AM") {
            if (self.startTime() === '12:00 AM'||self.startTime() === '12:30 AM') {
              selectedHr = 0;
            } else {
              selectedHr = parseInt(self.startTime().split(" ")[0].split(":")[0]);
            }
          } else {
            if (self.startTime() === '12:00 PM'||self.startTime() === '12:30 PM') {
              selectedHr = 12;
            } else {
              selectedHr = parseInt(self.startTime().split(" ")[0].split(":")[0]) + 12;
            }
          }
          selectedMin= parseInt(self.startTime().split(" ")[0].split(":")[1]);
          jd=self.Duration().split(" ");//it will be variable based on distance(format is: 2 day 2hr 33min (or) 5hr 45min)
          if(jd[1]==="day(s)")
          {
              day=jd[0];hr=jd[2];min=jd[4];
          }else if(jd[1]==="hr(s)"){hr=jd[0];min=jd[2]}
     
var startDate=moment($('#startDate').val()).format("DD/MM/YYYY");// if it is 25/01/2016
/// how to add duration days hrs mins to the selected startDateand startTime and get the new date and time
}

here am selecting date DD/MM/YYYY into startDate.Time(hh:mm AM/PM) into startTime
based on duration am getting time into Duration as ex:3days 4 hrs 30min or sometimes based on distance am getting hrs min only.

then how to add duration to startTime and get new date time