The latest official closing date recorded on the Yosemite site [started in 1980] stands at December 11 1995.

I'm gonna take a second guess that would break that record and gonna say;

December 12th @ 4pm.

Any takers ? [At least it'll keep the game alive]

I won't be happy if it's December 2nd as I considered this at the outset, in keeping with Birthdays etc. It's our Anniversary, but I felt 'way back then' when I first took a shot at it, that it would be too late !