JSFiddle - React, Tailwind, and code Playground
JavaScript
Number.prototype.toMMSS = function () {
d = this;
var sign = d < 0 ? "-" : "";
var min = Math.floor(Math.abs(d))
var sec = Math.floor((Math.abs(d) * 60) % 60);
return sign + (min < 10 ? "0" : "") + min + ":" + (sec < 10 ? "0" : "") + sec;
};
console.log(12.5.toMMSS()); // "08:15"