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This is a iso-year-week-day method for the seq() generic.

Sequences can only be generated for "year" precision iso-year-week-day vectors. If you need to generate week-based sequences, you'll have to convert to a time point first.

When calling seq(), exactly two of the following must be specified:

  • to

  • by

  • Either length.out or along.with


# S3 method for clock_iso_year_week_day
seq(from, to = NULL, by = NULL, length.out = NULL, along.with = NULL, ...)




A "year" precision iso-year-week-day to start the sequence from.

from is always included in the result.


[clock_iso_year_week_day(1) / NULL]

A "year" precision iso-year-week-day to stop the sequence at.

to is cast to the type of from.

to is only included in the result if the resulting sequence divides the distance between from and to exactly.


[integer(1) / clock_duration(1) / NULL]

The unit to increment the sequence by.

If by is an integer, it is transformed into a duration with the precision of from.

If by is a duration, it is cast to the type of from.


[positive integer(1) / NULL]

The length of the resulting sequence.

If specified, along.with must be NULL.


[vector / NULL]

A vector who's length determines the length of the resulting sequence.

Equivalent to length.out = vec_size(along.with).

If specified, length.out must be NULL.


These dots are for future extensions and must be empty.


A sequence with the type of from.


# Yearly sequence
x <- seq(iso_year_week_day(2020), iso_year_week_day(2026), by = 2)
#> <iso_year_week_day<year>[4]>
#> [1] "2020" "2022" "2024" "2026"

# Which we can then set the week of.
# Some years have 53 ISO weeks, some have 52.
set_week(x, "last")
#> <iso_year_week_day<week>[4]>
#> [1] "2020-W53" "2022-W52" "2024-W52" "2026-W53"