Extract ISO year and week components

Returns the ISO 8601 year and week for a weeknumber vector. For convenience, character, factor, Date, POSIXct, and POSIXlt inputs are first converted with as_weeknumber().

Usage

year_week(x)

Arguments

x

A weeknumber vector, or an object coercible with as_weeknumber().

Value

A named list with components year and week, each the same length as x. Missing inputs produce missing values in both components.

Examples

x <- make_weeknumber(c(2019, 2020, NA), c(52, 53, NA))
year_week(x)
#> $year
#> [1] 2019 2020   NA
#> 
#> $week
#> [1] 52 53 NA
#> 

year_week(as.Date(c("2020-12-28", "2021-01-04")))
#> $year
#> [1] 2020 2021
#> 
#> $week
#> [1] 53  1
#>