Original: So, using the original proposed adoption date, Thursday, 4 October 1582 would be followed by Friday 15 October.
Simplified: Spain, Portugal, the Polish-Lithuanian Commonwealth, and most of Italy started to use the new calendar on Friday, 15 October 1582, following Julian Thursday, October 4 1582. Alaska In Alaska Friday, October 6, 1867 was followed by Friday, October 18 1867.