Manipulation, Translation, Formatting and the fact that everything works perfectly and bug free. Also the fact that people have started to create its packages in different platforms.

It very versatile. It offers a lot of functions to get rid of manual date transformation, international date handling, add and subtract days, months, hours, minutes and years from dates... The documentation is very complete and easy to navigate through, and in their website, you can just open the browser devtools and try it live, without the hassling of downloading and creating a new project to test it. It is offered in a entire myriad of sources. Youcan clone the repository (it is Open Source) and copy it to your project, you can use meteor to install it, download the bundle from the website and use npm/yart to add it as a dependency to your project. Since it is Open Source, it is an extra check point of safety. It is the community who reviews the code and makes sure that nothing wrong enters the codebase, So there is no concern over security.

Helper library which simplifies validation of javascript dates as well as perform operations on the date like adding, subtracting using Moment.js. It also provides methods that can be used to display dates in various formats