docs: https://day.js.org/docs/en/plugin/duration
https://replit.com/@hungdev/dayjs-diff#index.js
const dayjs = require('dayjs');
require('dayjs/locale/vi'); // Import locale để có các chuỗi ngôn ngữ Việt Nam
var durationExt = require('dayjs/plugin/duration')
dayjs.extend(durationExt)