Moment.js is a legacy project, now in maintenance mode. In most cases, you should choose a different library.
For more details and recommendations, please see Project Status in the docs.
Moment.js is freely distributable under the terms of the MIT license.
I've been using Moment.js since I started web development, the biggest advantage to using it is its amazing API which is pretty much self-explanatory but it ends there, The list of disadvantages is really huge so I'll try my best to keep it as short as possible: - Mutable instances: A common gotcha with using Moment.js is that you often think that manipulation methods such as ".add" and ".sub" create a new copy of the date instance but that's not right, you end up getting stuck in complex date issues that take hours to solve. - Huge bundle size: Moment.js has a ginormous bundle size due to it cramming everything in a single package that doesn't support tree-shaking so you end up making your app's bundle size significantly larger by installing Moment.js to it. - Abandoned: Moment.js's maintainers have announced that they're abandoning the project for Luxon, which is much more complicated than Moment.js itself - Slow performance: I've been using Moment.js for quite a while on a stock market analytics site, the site used to lag on mobile devices since the site used to map over large arrays (1000+ entries) and process their dates using Moment.js. As soon as I switched it out for an alternative, the app became a lot faster than it ever was! Two alternatives I can recommend are: - Day.js, which is a much more lightweight date processing plugin that has an API that's very similar to Moment.js's - date-fns, which is also very lightweight and extremely fast (I switched to using this after Moment.js was abandoned), it's immutable as well so if you're into functional programming, you'll find this pretty much better than Moment.js in every way
I've used moment extensively in the past for creating user-friendly dates for a few web and social apps. It's very powerful and flexible in terms of functionality, and also supports i18n. However, it's monolithic and has a significant footprint, so it has a severe effect on the bundle size, which is not what you want from a date library. If I were to choose a library today, I'd probably go with date-fns or luxon.
It does make developers lives easier when it comes to working with dates and times. It also has been a great example of documentation. It got too large for its boots though and there are now a number of alternatives that meets most of people's needs while are much more optimised in terms of bundle size of what users have to download. The other gotchya is that moment is mutable, meaning you need to be careful when trying to test it since if you change the date, it could have unintended consequences and change the date for a test you didn't mean it to. Overall, consider using other libraries (which you can find in their documentation), this should not be your go to date time library, you should look to use something like Luxon or date-fns which are immutable apis and also are more performant.
I used moment in many of my web applications. I feel its mature enough. It has a great documentation for the apps. Flexiblity of playing with date and time is really awesome. But with the recent web development standards i see that it recommends some ther libraties with lightweight. As in moment js with entire package it will be nearing to 70-71 KB in app bundle size. It will be great if we give some optimization on the bundle size on app so we can continue using with modern standards Other than large bundle size. It is a perfect tool to manage date and times. AFAIK this project in maintenance mode