Original: 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, which was still on the Julian calendar.
Simplified: Alaska In Alaska Friday, October 6, 1867 was followed by Friday, October 18 1867. The day was still called Friday because when the US bought Alaska from Russia, the International Date Line was changed when the Gregorian calendar was adopted.