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Date to ISO year (numeric)

Source: R/conversion_date_isoweek_isoyear.R
date_to_isoyear_n.Rd

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

Usage

date_to_isoyear_n(x = lubridate::today())

# Default S3 method
date_to_isoyear_n(x)

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

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

Arguments

x

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

Value

ISO year as an integer vector (e.g. 2021).

Details

The ISO 8601 week-based year can differ from the calendar year near the start and end of January and December. See date_to_isoyear_c() for the rules used to assign weeks and years.

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_isoweek_n()

Examples

date_to_isoyear_n(as.Date("2021-08-11"))
#> [1] 2021
date_to_isoyear_n("2021-01-01")
#> [1] 2020