https://en.wikipedia.org/wiki/Date_and_time_representation_by_country https://en.wikipedia.org/wiki/Date_and_time_representation_b... with a nice svg on the sid

https://en.wikipedia.org/wiki/Date_and_time_representation_by_country https://en.wikipedia.org/wiki/Date_and_time_representation_b... with a nice svg on the side. I wouldn't say "entire countries", but definitely a lot of people. I grew up (in canada) with 12 hour clocks.