There's a read more button on the announcement. If you pressed that, it'd take you to the full announcement, where it says December 21 is when the changes should take place.
As I said, be observant.
Don't be such an arrogant arse, it really isn't helpful.
The date when the change was due to come into effect was one of the most significant bits of information so it should have been right at the top of the announcement - preferably in bold red type.
