Greasemonkey/Tampermonkey script to convert Steam's decimal time played (e.g. "4.7 hrs") to hours and minutes

steam-playtime-fix.js

// ==UserScript==
// @name         Sane Steam Playtimes
// @namespace    http://sjm.io/
// @version      0.1
// @description  Convert Steam's decimal time played (e.g. "4.7 hrs") to hours and minutes
// @author       Simon Morgan
// @match        http://steamcommunity.com/id/*
// @grant        none
// ==/UserScript==

(function () {
  "use strict";

  let timeString = /\d+\.\d\s+hrs/;
  let hoursString = /\d+\.\d/;

  function decimalToHoursMinutes(decimalTime) {
    let hours = Math.floor(decimalTime);
    let minutes = Math.floor((decimalTime % 1) * 60);

    return hours + " hrs" + (minutes > 0 ? ", " + minutes + " mins" : "");
  }

  function processElement(e) {
    if (timeString.test(e.innerHTML)) {
      let hours = e.innerHTML.match(hoursString);
      e.innerHTML = e.innerHTML.replace(timeString, decimalToHoursMinutes(
        hours[0]));
    }
  }

  let gameDetailsElements = document.querySelectorAll(
    "div.game_info > div.game_info_details");
  gameDetailsElements.forEach(processElement);
})();