Calendar reform  

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Kunstformen der Natur (1904) by Ernst Haeckel
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Kunstformen der Natur (1904) by Ernst Haeckel

A calendar reform is any significant revision of a calendar system. The term sometimes is used instead for a proposal to switch to a different calendar.

Most calendars have several rules which could be altered by reform:

  • If and how days are grouped into subdivisions such as months and weeks, and days outside those subdivisions, if any.
  • Which years are leap years and common years and how they differ.
  • Numbering of years, selection of the epoch, and the issue of year zero.
  • Start of the year (such as winter solstice, January 1, March 1, spring equinox, Easter).
  • If a week is retained, the start, length, and names of its days.
  • Start of the day (midnight, sunrise, noon, or sunset).
  • If months are retained, number, lengths, and names of months,
  • Special days and periods (such as leap day or intercalary day).
  • Alignment with social cycles.
  • Alignment with astronomic cycles.
  • Alignment with biological cycles.
  • Literal notation of dates.

See also

Specific proposals

There have been many specific calendar proposals to replace the Gregorian Calendar:

The following count one or more days outside the standard seven-day week:

The following are leap week calendars:

The following track the moon as well as the sun:

There have also been proposals to revise the way years are numbered:




Unless indicated otherwise, the text in this article is either based on Wikipedia article "Calendar reform" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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