calcal (version 1.0.0)

iso_date: ISO calendar dates

Description

In ISO 8601 date objects, weeks are defined as starting on Mondays. Week 1 is the first week with at least 4 days in the year. Equivalently, it is the week containing 4 January. There is no week 0; instead week 1 of a year may begin in the previous calendar year.

Usage

iso_date(year = integer(), week = integer(), day = integer())
as_iso(date)

Value

An iso vector object

Arguments

year

A numeric vector of years

week

A numeric vector of weeks

day

A numeric vector of days

date

Vector of dates on some calendar

Details

More flexible week numbering is possible using Gregorian dates with week_of_year().

See Also

cal_iso, week_of_year

Examples

iso <- new_date(year = 2025, week = 23, day = 2:4, calendar = cal_iso)
iso
iso_date(2025, 23, 2:4)
as_gregorian(iso_date(2025, 23, 2:4))
as_iso(gregorian_date(2025, 1, 1:31))
as_iso("2016-01-01")
as_iso(Sys.Date())
tibble::tibble(
  x = seq(as.Date("2025-01-01"), as.Date("2025-12-31"), by = "day"),
  y = as_iso(x)
)