Activate dark mode in https://web.whatsapp.com/
// ==UserScript==
// @name dark_mode_whatsappweb
// @namespace http://tampermonkey.net/
// @version 0.3
// @description Activate dark mode in https://web.whatsapp.com/
// @author https://github.com/bergpb
// @match https://web.whatsapp.com
// @grant none
// ==/UserScript==
window.addEventListener("load", function(event) {
'use strict';
var time = (new Date()).getHours();
const dayTime = time > 6 && time < 18;
if(!dayTime){
console.log("It's a darkness night");
document.body.classList.add("dark");
} else {
console.log("It's a shining day");
}
});