Icelandic calendar dates — icelandic

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[11]>
#>  [1] 2024-Win-26-Sun 2024-Win-26-Mon 2024-Win-26-Tue 2024-Win-26-Wed
#>  [5] 2025-Sum-01-Thu 2025-Sum-01-Fri 2025-Sum-01-Sat 2025-Sum-01-Sun
#>  [9] 2025-Sum-01-Mon 2025-Sum-01-Tue 2025-Sum-01-Wed
icelandic_date(2025, 1, 6, 0:6) |>
  day_of_week()
#> [1] "Sunnudagur"   "Manudagur"    "Þriðjudagur"  "Miðvikudagur" "Fimmtudagur" 
#> [6] "Føstudagur"   "Laugardagur"