These are weekday methods for the arithmetic generics.
Also check out the examples on the
weekday() page for more advanced
# S3 method for clock_weekday add_days(x, n, ...)
A weekday vector.
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.
These dots are for future extensions and must be empty.
x after performing the arithmetic.
n are recycled against each other.