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When did a European country last change calendar?

When did a European country last change calendar?
1923
Greece adopted the Gregorian calendar, the last in Europe to do so

The Gregorian reform was promulgated in 1582 and adopted piecemeal over 341 years, largely along religious lines — Catholic countries first, Protestant later, Orthodox last. Britain switched in 1752 and skipped eleven days, going from 2 September to 14 September. Russia switched in 1918, which is why the October Revolution took place in November.

What
Greece adopted the Gregorian calendar, the last in Europe to do so
When
1923
Category
Countries and borders
Could this change?
Not in any foreseeable way. The event is closed.

Countries and borders

Question When
When did a country last join the United Nations? 14 July 2011
When was the US Constitution last amended? 7 May 1992
When did Britain last change its currency system? 15 February 1971
When did the US flag last change? 4 July 1960
When was a US state last admitted? 21 August 1959
When did the size of the US Supreme Court last change? 1869
When did the Union Jack last change? 1 January 1801

This page gives a date and never a "years ago". These pages are built as static files, so a computed interval would freeze at build time and quietly become wrong — which on a reference site is worse than making the reader do the subtraction.

Common questions

When did a European country last change calendar?
1923 — Greece adopted the Gregorian calendar, the last in Europe to do so.
What happened?
The Gregorian reform was promulgated in 1582 and adopted piecemeal over 341 years, largely along religious lines — Catholic countries first, Protestant later, Orthodox last. Britain switched in 1752 and skipped eleven days, going from 2 September to 14 September. Russia switched in 1918, which is why the October Revolution took place in November.

Related pages

Sources

  1. Wikidata — Wikimedia Foundation (CC0 1.0)

How these figures are compiled and checked