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A decimal calendar is a calendar which includes units of time based on the decimal system. For example a "decimal month" would be , or 36.5 days long.


Calendar of Romulus[]

Main article: Calendar of Romulus

The original Roman calendar consisted of ten months (however, the calendar year only lasted 304 days, with 61 days during winter not assigned to any month).[1] The months of Ianuarius and Februarius were added to the calendar by Numa Pompilius in 700 BC.[1]

Egyptian calendar[]

Main article: Egyptian calendar

The ancient Egyptian calendar consisted of twelve months, each divided into three weeks of ten days, with five intercalary days.[2]

French Republican Calendar[]

Main article: French Republican Calendar

The French Republican Calendar was introduced (along with decimal time) in 1793, and was similar to the ancient Egyptian calendar.[3] It consisted of twelve months, each divided into three décades of ten days, with five or six intercalary days called sansculottides.[3] The calendar was abolished by Napoleon on January 1, 1806.[3]


The Gregorian calendar, although enjoying near universal acceptance, has sometimes been criticized as being cumbersome, inefficient and culturally imperialistic; as a result a number of decimalized alternatives have been proposed as reforms.

A modern Messiah Calendar has been proposed with a 20-month year and a five-day week.

No decimal calendar proposal to date has gained a level of public acceptance sufficient to ensure its longterm success, and some have argued that the cost of any proposed conversion would far outweigh the savings that it might deliver.

  1. 1.0 1.1 Time and Date AS. "The Roman calendar". Time and Date AS. Retrieved 10 June 2012. 
  2. "Ancient Egyptian Calendar and Chronology". Rutgers University. Archived from the original on 19 July 2010. Retrieved 10 June 2012. 
  3. 3.0 3.1 3.2 Sanja Perovic (2012). "French Republican Calendar: Time, History and the Revolutionary Event". Journal for Eighteenth-Century Studies 35: 1–16. Template:Hide in printTemplate:Only in print.