When is rainbow dashes birthday?

No birth dates have been stated for any My Little Pony characters. Some have speculated that Her birthday is November 19th because when Pinkie Pie was talking about Dash's birthday, she states it was "week ago" when it was November 12th, the airing date. So that makes it possible to be the 19th. But this likely does not have any meaning to it, especially since the episode does not appear to take place in autumn.