Edit

BadMutable

Day.js is designed to be immutable, however, in order to make it fully compatible with moment.js in some legacy projects we introduced a plugin 🚨 BadMutable 🚨 to make Day.js mutable.

This is NOT good and NOT recommended for most projects.

With this plugin enabled, all setters will update the instance itself.

var badMutable = require("dayjs/plugin/badMutable");
// import badMutable from 'dayjs/plugin/badMutable' // ES 2015

dayjs.extend(badMutable);
// with 🚨 BadMutable 🚨 plugin
const today = dayjs();
today.add(1, "day");
console.log(today); // update itself, value will be tomorrow
← ArraySupportBigIntSupport →