User Script for Youtube to see only videos newer than 1 month on Main Page.

youtube-fresh-videos.js

// ==UserScript==
// @name         Youtube Fresh Videos only
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Filter Youtube Recommended to show only less then a month, with different styles for hours days and weeks.
// @author       Your Grandma
// @match        https://www.youtube.com/
// @icon         https://t1.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=https://youtube.com
// @grant        none
// ==/UserScript==


document.querySelector('#contents').insertAdjacentHTML('beforebegin',`
<a href="/" id="toggleFresh" style="color: white;font-size: 20px;margin: 20px 0px 0px 20px;border: 1px solid #5d5d5d;padding: 5px 10px;border-radius: 10px;background: #202020;text-decoration: none;align-self: baseline;"
onclick="localStorage.setItem('onlyFresh', ~~(!(1*(localStorage.getItem('onlyFresh') || 0)))); window.location.reload()"> Toggle Fresh Only</a>`);

let mainScript = () => {
    if(!(1*localStorage.getItem('onlyFresh')))return;
    let texts = ['minute', 'hour', 'day', 'week','1 month', 'month', 'year', 'Streamed', 'watching'];
    texts.forEach((text)=>{

        var headings = document.evaluate("//*[@id=\"metadata-line\"][contains(., '" + text + "')]", document, null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

        for (let i = 0; i < headings.snapshotLength; i++) {

            let thisHeading = headings.snapshotItem(i);
            if (~['month', 'year', 'Streamed', 'watching'].indexOf(text)) {

                thisHeading.innerText = 'old';
                thisHeading.closest('ytd-rich-item-renderer').style.display = "none";

            } else {
                thisHeading.innerText = thisHeading.innerText.replace(/\d (\w)/, c => c.toUpperCase())
                if (text === 'day')
                    thisHeading.closest('ytd-rich-item-renderer').setAttribute('style', 'background:rgba(0,0,0,.5) !important;box-shadow: 0px 0px 3px #ddd;');
                else if(text === 'week')
                    thisHeading.closest('ytd-rich-item-renderer').setAttribute('style', 'background:rgba(0,0,0,.4) !important;');
                else
                    thisHeading.closest('ytd-rich-item-renderer').setAttribute('style', 'background:rgba(255,255,255,.2) !important;');

            }
        }
    });
    document.querySelectorAll('[title^="Mix -"]').forEach(e=>e.closest('ytd-rich-item-renderer').style.display = "none");
}
mainScript();
window.onlyFresh = () => mainScript();
var targetNode = document.getElementById('contents');
var observer = new MutationObserver(mainScript);
observer.observe(targetNode, { childList: true });