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These are iso-year-week-day methods for the arithmetic generics.

You cannot add weeks or days to an iso-year-week-day calendar. Adding days is much more efficiently done by converting to a time point first by using as_naive_time() or as_sys_time(). Adding weeks is equally as efficient as adding 7 days. Additionally, adding weeks to an invalid iso-year-week object containing iso_year_week_day(2019, 53) would be undefined, as the 53rd ISO week of 2019 doesn't exist to begin with.


# S3 method for clock_iso_year_week_day
add_years(x, n, ...)




A iso-year-week-day vector.


[integer / clock_duration]

An integer vector to be converted to a duration, or a duration corresponding to the arithmetic function being used. This corresponds to the number of duration units to add. n may be negative to subtract units of duration.


These dots are for future extensions and must be empty.


x after performing the arithmetic.


x and n are recycled against each other.


x <- iso_year_week_day(2019, 1, 1)
add_years(x, 1:2)
#> <iso_year_week_day<day>[2]>
#> [1] "2020-W01-1" "2021-W01-1"