Speaking of days and dates, did you know that Alaska was the last state to adopt our current, Gregorian calendar? Many think our calendar has been around forever, but it is not that old.
In Alaska, the change took place when Friday, 6 October 1867 was followed again by Friday, 18 October after the US purchase of Alaska from Russia. Eleven days were skipped, and the day of the week was repeated on successive days, because the International Date Line was shifted from Alaska's eastern to western boundary along with the change to the Gregorian calendar.
In Russia the Gregorian calendar was accepted Wednesday, 31 January 1918, followed by Thursday, 14 February 1918, thus dropping 13 days from the calendar.
The last country of Eastern Orthodox Europe to adopt the Gregorian calendar was Greece on Thursday, 1 March 1923, which followed Wednesday, 15 February 1923. Korea adopted the Gregorian calendar on 1 January 1895. China finally agreed to use the Gregorian calendar 1 January 1929 (Yes, only eighty three years ago).
Many religious sects and countries still use other official calendars, but have unofficially adopted the Gregorian calendar for convenience of doing business. Kind of makes one question the exact dates in many history books. . .