Reviewed DateFormatter used for date conversion

[rchampourlier]

Reviewed how the DateFormatter is created to follow Apple's guidelines and demo implementation provided in this documentation.

IMO, it makes more sense not to consider user locale since we generally are parsing dates from a backend API, not user entered data. If we don't do it this way, it seems the dates will be converted using local settings, such as non-Gregorian calendar, AM/PM preferences, etc.

[dchohfi]

Could you add a property to configuration, so the user can switch between the locales? And if there's no locale use what you've done.

[dchohfi]

Btw, nice add :)

[rchampourlier]

Wow, sorry, I completely forgot I hadn't even answered to your comment... I'll have to force myself to get some time to finish this so you can merge it...

Again, please excuse me for the delay and thanks for notifying me again!