roman: Roman calendar dates

In calcal: Calendrical Calculations

Roman calendar dates

Description

The Roman calendar (as defined here) is the same as the Julian calendar but with different nomenclature. Rather than use a (year, month, day) triple for each date, it specifies dates using year, month, event, count.

Usage

roman_date(
  year = integer(),
  month = integer(),
  event = integer(),
  count = integer(),
  leap_day = logical()
)

as_roman(date)

Arguments

year	A numeric vector of years
month	A numeric vector of months
event	A numeric vector of events: 1 = Kalends, 2 = Nones, 3 = Ides
count	A numeric vector of counts
leap_day	A logical vector indicating if day is a leap day
date	Vector of dates on some calendar

Value

A roman vector object

See Also

cal_roman

Examples

roman_date(66, 4, 1, 1, FALSE)
new_date(year = 66, month = 4, event = 1, count = 1, leap_day = FALSE, calendar = cal_roman)
as_roman("2016-01-01")
tibble::tibble(
  x = seq(as.Date("2025-01-01"), as.Date("2025-12-31"), by = "day"),
  y = as_roman(x)
)

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