Add multiple DateTime Duration strings together using JavaScript to get total duration

Question

I have an HTML Table used to generate a Calendar which shows TimeClock entries for each day a user has worked and clocked in and out of the system. Each day also shows the

Answer 1

Try this:

function hhmmssToSeconds(str)  {
    var arr = str.split(':').map(Number);
    return (arr[0] * 3600) + (arr[1] * 60) + arr[2];
};

function secondsToHHMMSS(seconds) {
    var hours = parseInt(seconds / 3600, 10),
        minutes = parseInt((seconds / 60) % 60, 10),
        seconds = parseInt(seconds % 3600 % 60, 10);

    return [hours, minutes, seconds].map(function (i) { return i.toString().length === 2 ? i : '0' + i; }).join(':');
}

Then:

var t1 = hhmmssToSeconds('40:50:40'),
    t2 = hhmmssToSeconds('04:12:30');

var result = secondsToHHMMSS(t1 + t2); // '45:03:10'