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intl-explorer
Intl Explorer is an interactive tool for experimenting and trying out the ECMAScript Internationalization API.
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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.
Intl Explorer
Yeah, it's a commonjs module so it doesn't tree shake. It's also no longer maintained. day.js seems to be the go-to lib these days: https://day.js.org/
What the heck do you have to support that doesn't support this? IE11 does handle it, according to both caniuse.com and MDN.
Try out date-fns next time you need something. It's modular, unlike Moment (and is also not abandoned).