JavaScript DateDiff

Earlier I blogged about creating a DateDiff function in JavaScript that returns calendar difference between two dates. It returns the Year, Months and Days difference between two dates. Here is the link for my previous blog

http://www.spaprogrammer.com/2015/03/javascript-datediff.html

I enhanced that DateDiff function to return additional details such as Hours, Minutes and Seconds. Here is the updated code

function dateDiff(startdate, enddate) {

    //define moments for the startdate and enddate

    var startdateMoment = moment(startdate);

    var enddateMoment = moment(enddate);

    if (startdateMoment.isValid() === true && enddateMoment.isValid() === true) {

        //getting the difference in years

        var years = enddateMoment.diff(startdateMoment, 'years');

        //to calculate the months, first get the previous year and then subtract it

        startdateMoment.add(years, 'years')

        var months = enddateMoment.diff(startdateMoment, 'months')

        //to calculate the days, first get the previous month and then subtract it

        startdateMoment.add(months, 'months');

        var days = enddateMoment.diff(startdateMoment, 'days')

        //Similar to days go the previous day

        startdateMoment.add(days, 'days')

        var hours = enddateMoment.diff(startdateMoment, 'hours')

        //Getting minutes

        startdateMoment.add(hours, 'hours')

        var minutes = enddateMoment.diff(startdateMoment, 'minutes')

        //Similar to days go the previous day

        startdateMoment.add(minutes, 'minutes')

        var seconds = enddateMoment.diff(startdateMoment, 'seconds')

        return {

            years: years,

            months: months,

            days: days,

            hours: hours,

            minutes: minutes,

            seconds: seconds

        };

    }

    else {

        return undefined;

    }

}

Plunker for this DateDiff function

http://plnkr.co/edit/mWsW9q?p=preview