Talk:List of adoption dates of the Gregorian calendar by country

One more table: [1] Burzuchius (talk) 16:50, 4 October 2018 (UTC)

Going pastward

When a country moved from Gregorian back to Julian, did it cause confusion and problems? When the same date appears twice, it looks more problematic than when it just canceled–like in Time formatting and storage bugs. הראש (talk) 15:50, 25 January 2020 (UTC)

Finland, 1753 or 1918?

The table says Finland changed the calendar in the same fashion as Sweden, but Finland is not included in the source given for Sweden. Since Finland was part of the Swedish Empire in the years 1700–1712 of the first two calendar entries; the 1 day adjustment should have likely been applied to Finland as well.

However, Finland would not remain part of Sweden, and after 1721 it became part of the Russian Empire, lasting to 1917. This would mean that when Sweden moved over to the Gregorian calendar in 1753, this would not include Finland as far as I can see. Russia adopted the Gregorian calendar with the first day of 14 Feb 1918, and an independent monarchy was established in Finland on 18 May 1918. So I would assume Finland started using the Gregorian calendar together with Russia in 1918.

But this is just assumption, and I have no source, aside from this calendrical issues document which states "The Russian empire (including Finland and the Baltic states) did not convert to the Gregorian calendar until the Soviet revolution of 1917." But that is also just a vague clam and does not match the year 1918. But I would say including Finland as part of Sweden without a source is just as much assumption as this.

Liggliluff (talk) 17:17, 12 July 2021 (UTC)

From the Finnish lands of Sweden, only part (Vyborg Governorate) moved to Russia in 1721, other lands remained part of Sweden until 1809 when the autonomous Grand Duchy of Finland was formes as a part of the Russian Empire. The main calendar used in Grand Duchy of Finland was Gregorian, but since the Duchy was part of the Russian Empire, Julian was also used in some documents. In this case, double dates were written.

So:

Vyborg Governorate: Julian 1700 Swedish 1712 Julian 1809 Gregorian with some use of Julian 1918 Gregorian

Other Finnish lands: Julian 1700 Swedish 1712 Julian 1753 Gregorian 1809 Gregorian with some use of Julian 1918 Gregorian

Burzuchius (talk) 19:29, 12 July 2021 (UTC)