icelandic_date: Icelandic calendar dates

In calcal: Calendrical Calculations

Icelandic calendar dates

Description

The Icelandic calendar, still in use in Iceland, divides times into 7-day weeks and two seasons: Summer and Winter. Summer starts on the first Thursday after April 18th, and Winter 180 days earlier. Ordinary years have 52 weeks with leap years having 53 weeks. The leap week occurs every 5-7 years in midsummer.

Usage

icelandic_date(
  year = integer(),
  season = integer(),
  week = integer(),
  weekday = integer()
)

as_icelandic(date)

Arguments

year	A numeric vector of years
season	A numeric vector of seasons (1 = Summer, 2 = Winter)
week	A numeric vector of weeks within the season (1 to 28)
weekday	A number vector containing day of week (0 = Sunday, 1 = Monday, ..., 6 = Saturday))
date	A numeric vector of dates

Value

An icelandic vector object

Examples

gregorian_date(2025, 4, 20:30) |>
  as_icelandic()
icelandic_date(2025, 1, 6, 0:6) |>
  day_of_week()

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