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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.
Day.js is awesome for comparing dates! You just need to make dayjs objects from whatever dates you have. You can use the dayjs() function with different inputs and formats. Here’s an example:
Moment.js lets you do amazing things with dates and times in JavaScript. You can easily compare, change, and format them in different ways. For example, you can say things like "today is Monday" or "3 hours ago" or "12/31/2020". To start with Moment.js, you need to install it and import it into your JavaScript project. For example:
Date-fns is a modern and modular library that lets you do amazing things with dates and times. You can parse, sort dates, and format them in any way you want. You can also use plugins to add more features, like natural language comparisons, relative time, or custom formats.