Decimal calendar

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

A decimal calendar is a calendar which includes units of time based on the decimal system. For example a "decimal month" would consist of a year with 10 months and 36.52422 days per month.


Egyptian calendar[edit]

The ancient Egyptian calendar consisted of twelve months, each divided into three weeks of ten days, with five intercalary days.[1]

Calendar of Romulus[edit]

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.[2] The months of Ianuarius and Februarius were added to the calendar by Numa Pompilius in 700 BCE.[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]


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

See also[edit]


  1. ^ "Ancient Egyptian Calendar and Chronology" (PDF). Rutgers University. Archived from the original (PDF) on 19 July 2010. Retrieved 10 June 2012.
  2. ^ a b Konstantin, Bikos; Hocken, Vigdis. "The Roman calendar". Stavanger, Norway: Time and Date AS. Retrieved 10 June 2012.
  3. ^ a b c Sanja Perovic (2012). "French Republican Calendar: Time, History and the Revolutionary Event". Journal for Eighteenth-Century Studies. 35: 1–16. doi:10.1111/j.1754-0208.2011.00408.x.