Decimal calendar

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A decimal calendar is a calendar which includes units of time based on the decimal system.


Calendar of Romulus[edit]

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[edit]

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[edit]

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]


See also: Calendar reform

The modern Gregorian calendar does not use decimal units of time, however several proposed calendar systems do. None of these have achieved widespread use.

See also[edit]


  1. ^ a b Time and Date AS. "The Roman calendar". Time and Date AS. Retrieved 10 June 2012. 
  2. ^ "Ancient Egyptian Calendar and Chronology" (PDF). Rutgers University. Archived from the original (PDF) on 19 July 2010. Retrieved 10 June 2012. 
  3. ^ a b c Sanja Perovic. "French Republican Calendar: Time, History and the Revolutionary Event". Journal for Eighteenth-Century Studies. Retrieved 10 June 2012.