How to Convert Seconds to HH:MM:SS Time String in JavaScript?

Convert Seconds to Time String in JavaScript (hh:mm:ss)

Often, we need to convert a duration in seconds to a human-readable time string formatted as hours:minutes:seconds. This can be easily achieved in JavaScript using a simple algorithm involving mathematical calculations and string concatenation.

To convert seconds to the desired time string, we first need to extract the hours, minutes, and seconds from the given number of seconds.

Here's the JavaScript snippet for converting seconds to a colon-separated time string:

String.prototype.toHHMMSS = function () {
    var sec_num = parseInt(this, 10); // don't forget the second param
    var hours   = Math.floor(sec_num / 3600);
    var minutes = Math.floor((sec_num - (hours * 3600)) / 60);
    var seconds = sec_num - (hours * 3600) - (minutes * 60);

    if (hours   < 10) {hours   = "0"+hours;}
    if (minutes < 10) {minutes = "0"+minutes;}
    if (seconds < 10) {seconds = "0"+seconds;}
    return hours+':'+minutes+':'+seconds;
}

Usage:

alert("5678".toHHMMSS());

Output:

01:34:38

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