Javascript convert seconds to a date object

You can pass unix timestamp milliseconds as an argument to the Date constructor:

var secs = 30;
new Date(secs * 1000);

Outputs:

Date 1970-01-01T00:00:30.000Z

You can try like this:

function toDateTime(secs) {
    var t = new Date(1970, 0, 1); // Epoch
    t.setSeconds(secs);
    return t;
}

Info on epoch date.

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