Gregorian calendar
England and the rest of the British Empire (including what is now the US and Canada) adopted the Gregorian calendar in 1752. Because 1600 was a leap year in both calendars but the Julian calendar had a leap year in 1700 but the Gregorian calendar did not, this meant that eleven days needed to be skipped. Wednesday, September 2, 1752 was followed by Thursday, September 14, 1752.