Calendar: iso-year-week-day

iso_year_week_day() constructs a calendar from the ISO year, week number, and week day.

iso_year_week_day(
  year,
  week = NULL,
  day = NULL,
  hour = NULL,
  minute = NULL,
  second = NULL,
  subsecond = NULL,
  ...,
  subsecond_precision = NULL
)

Arguments

year	[integer] The ISO year. Values [-32767, 32767] are generally allowed.
week	[integer / "last" / NULL] The ISO week. Values [1, 53] are allowed. If "last", then the last week of the ISO year is returned.
day	[integer / NULL] The day of the week. Values [1, 7] are allowed, with 1 = Monday and 7 = Sunday, in accordance with the ISO specifications.
hour	[integer / NULL] The hour. Values [0, 23] are allowed.
minute	[integer / NULL] The minute. Values [0, 59] are allowed.
second	[integer / NULL] The second. Values [0, 59] are allowed.
subsecond	[integer / NULL] The subsecond. If specified, subsecond_precision must also be specified to determine how to interpret the subsecond. If using milliseconds, values [0, 999] are allowed. If using microseconds, values [0, 999999] are allowed. If using nanoseconds, values [0, 999999999] are allowed.
...	These dots are for future extensions and must be empty.
subsecond_precision	[character(1) / NULL] The precision to interpret subsecond as. One of: "millisecond", "microsecond", or "nanosecond".

Value

A iso-year-week-day calendar vector.

Details

Fields are recycled against each other.

Fields are collected in order until the first NULL field is located. No fields after the first NULL field are used.

Examples

# Year-week
x <- iso_year_week_day(2019:2025, 1)
x
#> <iso_year_week_day<week>[7]>
#> [1] "2019-W01" "2020-W01" "2021-W01" "2022-W01" "2023-W01" "2024-W01" "2025-W01"

# 2nd day of the first ISO week in multiple years
iso_days <- set_day(x, clock_iso_weekdays$tuesday)
iso_days
#> <iso_year_week_day<day>[7]>
#> [1] "2019-W01-2" "2020-W01-2" "2021-W01-2" "2022-W01-2" "2023-W01-2"
#> [6] "2024-W01-2" "2025-W01-2"

# What year-month-day is this?
as_year_month_day(iso_days)
#> <year_month_day<day>[7]>
#> [1] "2019-01-01" "2019-12-31" "2021-01-05" "2022-01-04" "2023-01-03"
#> [6] "2024-01-02" "2024-12-31"