Stackoverflow date outdate marker

stackoverflow-date-outdate-marker.user.js

// ==UserScript==
// @name         Stackoverflow dates
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Stackoverflow dates outdate marker
// @author       You
// @include        /^https:\/\/(.+\.)?stackoverflow\.com/
// @icon         https://www.google.com/s2/favicons?domain=stackoverflow.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const style = document.createElement('style');
    style.innerHTML = `
    .outdate{
    color: white;
    font-weight: bold;
    background: red;
    padding: 2px 8px 2px 8px;
    }
    `;
    document.head.appendChild(style);

    const dateElements = [...document.querySelectorAll('[title]')]
    .filter(el=>/^\d{4}-\d\d-\d\d \d\d:\d\d:\d\dZ$/.test(el.getAttribute('title')))
    .map(el=>{
        let date = new Date(el.getAttribute('title'));
        let relative = Date.now() - date.getTime();
        let datetimeStr =(date.toLocaleString()).replace(/\(.*\)/,'').replace(/GMT[+-]\d{4}/,'')
        let today = new Date().toLocaleDateString();
        datetimeStr = datetimeStr.replace(today,'Сегодня');
        if(relative> 4*60*60*1000){
            el.classList.add('outdate');
        }
        el.innerHTML = datetimeStr;
        return [el,datetimeStr];
    });

    setInterval(()=>dateElements.forEach(([el,val])=>(el.innerHTML=val)),10*1000);

})();