Date: 2024aug24 Q. Calendar change in 1752 A. The Linux command

cal 09 1752

Shows

September 1752 Su Mo Tu We Th Fr Sa 1 2 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Notice the gap between 2 and 14. This was done in Britain (and territories) to transition from the Julian calendar to the better Gregorian Calendar. More info about this "new style" calendar https://en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750