Interesting calendar trivia. The Gregorian calendar was adopted in Sept. 1752: Britain and the British Empire (including the eastern part of what is now the Un

Interesting calendar trivia. The Gregorian calendar was adopted in Sept. 1752: Britain and the British Empire (including the eastern part of what is now the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days. Wednesday, 2 September 1752 was followed by Thursday, 14 September 1752. So, in this case, it looks like cal is doing the right thing.