Convert seconds to days, hours, minutes and seconds

Question

I have a Javascript timing event with an infinite loop with a stop button.

It will display numbers when start button is click.Now I want this numbers converted to so

Answer 1

This answer builds upon on Andris' approach to this question, but it doesn't have trailing commas if lesser units are not present.

It also borrows from this answer dealing with joining array values only if truthy:

https://stackoverflow.com/a/19903063

I'm not a javascript god and it's probably horribly over-engineered, but hopefully readable and correct!

function sformat(s) {

    // create array of day, hour, minute and second values
    var fm = [
        Math.floor(s / (3600 * 24)),
        Math.floor(s % (3600 * 24) / 3600),
        Math.floor(s % 3600 / 60),
        Math.floor(s % 60)
    ];

    // map over array
    return $.map(fm, function(v, i) {

        // if a truthy value
        if (Boolean(v)) {

            // add the relevant value suffix
            if (i === 0) {
                v = plural(v, "day");
            } else if (i === 1) {
                v = plural(v, "hour");
            } else if (i === 2) {
                v = plural(v, "minute");
            } else if (i === 3) {
                v = plural(v, "second");
            }

            return v;
        }

    }).join(', ');

}

function plural(value, unit) {

    if (value === 1) {
        return value + " " + unit;
    } else if (value > 1) {
        return value + " " + unit + "s";
    }

}


console.log(sformat(60)); // 1 minute
console.log(sformat(3600)); // 1 hour
console.log(sformat(86400)); // 1 day
console.log(sformat(8991)); // 2 hours, 29 minutes, 51 seconds

If you needed to convey the duration more 'casually' in words, you could also do something like:

var remaining_duration = sformat(117);
// if a value is returned, add some prefix and suffix 
if (remaining_duration !== "") {
    remaining_duration = "about " + remaining_duration + " left";
}
$(".remaining_duration").text(remaining_duration);

// returns 'about 1 minute, 57 seconds left'