List of adoption dates of the Gregorian calendar by country information
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This is a list of adoption dates of the Gregorian calendar by country. For explanation, see the article about the Gregorian calendar.
Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The historic area does not necessarily match the present-day area or country. The column "Present country" only provides a logic search entry. With a few exceptions, the former colonies of European powers are not shown separately.
There are only four countries which have not adopted the Gregorian calendar: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran and Afghanistan (Solar Hijri calendar).[1]
^Heydari-Malayeri, M. "A concise review of the Iranian calendar". aramis.obspm.fr. Retrieved 15 April 2022.
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