The date October 8, 1582, does not exist in the records of Italy, Poland, Portugal and Spain, the result of that year’s implementation of the Gregorian calendar.
Fearing a Catholic plot, Protestant countries adopted the calendar much later. By the time Britain and its colonies got on board in 1752, eleven days had to be “disappeared.” This caused riots in some places, as people suspected some horrible chicanery — and in actual fact the inspiration for the “Give us our eleven days” protest had something to do with taxes, so it might not have been as idiotic as it now seems.