JSFiddle - React, Tailwind, and code Playground

by chridam

JavaScript

Number.prototype.toHHMMSS = function () { 
    d = this;
    var h = Math.floor(d / 3600);
    var m = Math.floor(d % 3600 / 60);
    var s = Math.floor(d % 3600 % 60);
    return ((h > 0 ? h + ":" : "") + (m > 0 ? (h > 0 && m < 10 ? "0" : "") + m + ":" : "0:") + (s < 10 ? "0" : "") + s); 
};

var travelTime = 9 - 6.75;
console.log(travelTime.toHHMMSS());