Some date extensions should be class functions

[Esqarrouth]

Some date extensions should be class functions, there is no need to create a new nsdate() object imo.

[Esqarrouth]

https://github.com/erica/SwiftDates/tree/master/Sources
Some cool date stuff

[piv199]

@goktugyil what extensions you are talking about?

[Esqarrouth]

I think DateMath and DateUtils will be pretty useful. Also other extensions might give inspirations.