Lmao nice!
I don't know the exact time, but I'm sure for a lot of us it was on Aug 29, 2013 when the Hangar Module launched.
You're giving me memberberries now about rocking around in the Greycat and checking out all our V1 ships. Getting into a Constellation for the first time was amazing :D
It's been a lot of fun following the games development. I just hope we get to a state of better playability sooner than later so I can enjoy my game-time better. The last few years I've felt less and less inclined to jump in each patch.