I'm not too bad at memorizing numbers, actually. I can recite Pi to ten decimals, e to (counting) thirteen, I know the exact light speed by heart (299 792 458 m/s... yes, I'm a freak. 3 million kilometers a second is way close enough for anything I've ever encountered in my theoretical physics life), know the mass and the charge of the electron,... in short, numbers who have to do with something interesting (yeah right ) like physics and maths.
But dates? What's so important about 1789(*)? Do I have to use that somewhere in a calculation? Is it an universal constant? Does it tell how matter and energy behaves?
(*) French Revolution.