The Gregorian Calendar
The Case For: Makes every kid named “Greg” feel very special when they’re five or six years old and learn about it.
The Case Against: Not only did not have a year 0, also did not have a year 1, 2, 6, 28, or 118.
The Case For: Brings to the confusing modern world the sense that when you were a kid, you did this thins you didn’t know why because that’s what everyone said you were supposed to do.
The Case Against: Were invented in 1893 to sell more nationalism.