Docu review done: Tue 17 Oct 2023 10:54:59 AM CEST

ten days

It’s also, in addition to the oddities in Sweden, not a unique event, and the most recent civil (i.e. non-religious) calendar to change from Julian to Gregorian was in the 20th Century.

It’s worth noting that “the Western world” (as a whole) didn’t change in 1582. The Roman Catholic world (most of it, anyway) changed then, but the British were notoriously uncooperative with the Papists, and waited until September 1752…

$ cal 9 1752
   September 1752
Su Mo Tu We Th Fr Sa
       1  2 14 15 16
17 18 19 20 21 22 23
24 25 26 27 28 29 30

Source: thedilywtf/ten-days