[xarien]

I'd have gone a different way since my setup and approach was a bit different (I took a more visual approach). While this solution is elegant, it's also incredibly hard to do in the real world as it requires far too much knowledge to properly assign the "correct" definitions. It's no different than having a perfect health heuristic land on your lap.

When I did this a while back, my approach was to construct a 5x4 matrix with blanks (5 unique dates x 4 unique months). This allowed the clues to cross off entire rows and or columns until only 1 pair stood standing. Personally, I find the construction of the solution much more interesting than the problem itself given how many people participated.