french_date: French Revolutionary calendar dates

In calcal: Calendrical Calculations

French Revolutionary calendar dates

Description

There are two versions of the French Revolutionary Calendar. The original version, used from 1793, was kept in sync with the solar year by setting the first day of Vendemiaire to the autumnal equinox. The second version, proposed in 1795, was a simpler arithmetic calendar, but was never used. We distinguish the two by using "afrench" (for Arithmetic French) for the second form.

Usage

french_date(year = integer(), month = integer(), day = integer())

afrench_date(year = integer(), month = integer(), day = integer())

as_french(date)

as_afrench(date)

Arguments

year	year
month	month
day	day
date	A vector of dates on some calendar

Value

A vector of dates on the French Revolutionary calendar

Examples

french_date(1, 1, 1:15) |>
  as_gregorian()
french_date(1, 1, 1:15) |>
  day_of_week()

calcal documentation built on Feb. 25, 2026, 9:07 a.m.