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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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webpack
A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.
ℹ️ TC39, the major JavaScript standard's committee, is working on a new modern API called Temporal (see the proposal here) that solves all of the above issues. The Future of Date and Time in JavaScript by Christofer Eliasson is an excellent read of the history behind Temporal and what it means for JavaScript.
We wrote up examples for performance testing on perf.link and all of the tests and code are available in the Date/time performance examples GitHub repository. If you have a specific use-case, you can modify one of the provided examples. JavaScript date libraries contain hundreds of methods and features that we couldn't test them all. Instead, we opted to test the same methods demonstrated in our Codepens.
The Day.js documentation claims "If you use Moment.js, you already know how to use Day.js", which would make migrating easier. You can see direct comparisons at the excellent You don't (may not) need Moment.js. The code in our example CodePen is readable with the exception of the parsing and time zone cases.
date-fns doesn't package a browser build for NPM (see the related GitHub issue) and therefore only works on CDNs that transform for the browser like Skypack and ESM.run. However, documentation has examples labeled for the browser as both ESM(ES Modules) and ES2015. This ensures developers don't get confused trying to run Node.js backend code in the browser.
If Date fulfills almost all your needs but you don't want to deal with its downsides, Day.js is a great choice. Day.js's small size makes it ideal for build-tool free environments like CodePen and plain JS/HTML/CSS projects. If you're forced to support older browsers, Day.js 's Readme says it supports IE as far back as IE 7, though we did not test these capabilities.
Modularity + Tree shaking: Modular architecture allows you to shrink your library size by "tree-shaking" out any library code you're not using. Common build tools capable of tree-shaking include Webpack, Snowpack and Rollup.