Date to ISO week (numeric) — date_to_isoweek_n • cstime

Converts a date to its ISO 8601 week number, returned as a number.

Usage

date_to_isoweek_n(x = lubridate::today())

# Default S3 method
date_to_isoweek_n(x)

# S3 method for class 'character'
date_to_isoweek_n(x = lubridate::today())

# S3 method for class 'Date'
date_to_isoweek_n(x = lubridate::today())

Arguments

x: A Date object, or a character string in the format 'yyyy-mm-dd'.

Value

ISO week as an integer vector (1 to 53).

Details

ISO weeks run Monday to Sunday and are numbered 1 to 52 or 53. Week 1 is the week containing the first Thursday of the ISO year.

See also

vignette("date_conversion", package = "cstime"), which runs this function.

Other date-to-number converters: date_to_calmonth_n(), date_to_calyear_n(), date_to_isoquarter_n(), date_to_isoyear_n()

Examples

date_to_isoweek_n(as.Date("2021-08-11"))
#> [1] 32
date_to_isoweek_n("2021-01-01")
#> [1] 53