September 1752

September 1752 skipped 11 days in the British Empire (including American colonies) when switching from the Julian to Gregorian calendar.

What happened:

  • Wednesday, September 2, 1752 was followed by Thursday, September 14, 1752
  • 11 days removed: September 3-13, 1752 never existed
  • Reason: Julian calendar was 11 days out of sync with solar year
  • Countries affected: Britain, colonies (US/Canada weren't independent yet)

Why:

  • Julian calendar (since 45 BCE) had drifted
  • Gregorian calendar (1582) fixed leap year rules
  • Catholic countries adopted in 1582
  • Protestant Britain resisted until 1752

Result: Calendar caught up by deleting 11 days. People went to bed September 2, woke up September 14.

31 Dec 2025: I added a calendar (linux command line: "cal 9 1752")
   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 

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