September 3, 1752
With the adoption of the Gregorian calendar in 1752, September 2 was followed by September 14, skipping 11 days to correct the drift in the older Julian calendar. This change, enacted by the British Calendar Act of 1750, affected Britain and its colonies, including Ireland. According to popular (though likely exaggerated) accounts, some confused and angry citizens protested, crying: “Give us back our 11 days!”