Oops, I accidentally posted tomorrow.
Even by stackoverflow's UTC timezone standards it is still the 29th.
Am I missing something?
It's the 30th somewhere in the world.
From This meta.Stackexchange post :
Unless the requirement mentions a specific timezone, hats that are date-based are often awarded for 14 hours before and 12 hours after the specified date in UTC, to accommodate people everywhere in the world. This means you can earn such a hat even though for you it's not even that day yet.