As I came to understand quickly with my day job, working with international dates can be a major pain across different languages on the web. Not only are you dealing with traditional localization issues, but the format and order often changes significantly. For a while I tried relying on a simplistic in-house JS solution, but that fell apart as our site expanded to a progressively higher set of languages.
Moment.js is an excellent solution to this date problem. Download the languages you need and you’ll find yourself up and running very quickly, whether the issue is display or more complex manipulation.