File talk:Calendars world map.svg

Sub-Categories

 

Countries which have adopted the Gregorian calendar.

 

Countries which use a modified version of the Gregorian calendar.

 

Countries which use other calendars alongside the Gregorian calendar.

 

Countries which have not adopted the Gregorian calendar.

I think the current classification into four categories of adoption is a bit “undercomplex”.

In particular, the green category of “have adopted” does really mean “use the 12 irregular months and the 400-year leap cycle”. Countries differ in whether they also use the lunar part of the Gregorian calendar to determine some of their holidays (i.e. Easter and dependent ones):

• Some green countries observe no holidays depending on the Gregorian Computus or any other lunisolar algorithm.
• Some green countries do observe holidays depending on the Gregorian Computus.
• Some green countries observe holidays depending on a different lunisolar algorithm, e.g.:
  • Dionysian/Bedan Computus within the Julian calendar (e.g. Russia, Serbia, Georgia) or the Revised Julian calendar (e.g. Romania, Bulgaria, Ukraine)
  • Chinese (Lunar) Calendar (e.g. China, Vietnam) or one of the Buddhist calendars (e.g. Myanmar, Nepal, Cambodia)
  • Hebrew/Jewish calendar (Israel)
  • Hijri/Muslim/Islamic calendars (e.g. Saudi Arabia)

Unsurprisingly, almost all orange and red countries are using one of these latter variants as their primary calendar. — Christoph Päper 21:50, 29 December 2023 (UTC)