I have calculated the dates when Nintendo will announce when HG & SS will come out the US & UK.
~US of A~
Monday, March 8th, 2010
{} UK {}
Thursday, May 8th, 2010
Isn't it kind of drastic trying to figure out an exact date? I mean the calculation, if shown might prove to be evident, but anything can happen during now and then. Plus, release dates aren't really something you can caluculate unless you look at a specific pattern. Going by speculation and pattern wouldn't always be the best option to do calculations for a release date as again Game Freak and Nintendo has no obligation to follow it.
So, as nice as these dates are it is best to leave it at a estimated time frame as some may read this wrong and actually think of the release date being on the 8th of March next year for the US and UK when it possibly might not be.