Well there's no 14th month, so Europeans can't have Pi Day. And trying to work out stoner day 4/20 and the 'get off work and get stoned at 4:20PM' thing doesn't work either, but it's still Hitler's birthday either way. And this year we get to have the last day of the year as 12/31/23 being 123 twice. So our system is still vastly superior.