isoyearweekdaycountbetween {clock}  R Documentation 
This is an isoyearweekday method for the calendar_count_between()
generic. It counts the number of precision
units between start
and end
(i.e., the number of ISO years).
## S3 method for class 'clock_iso_year_week_day'
calendar_count_between(start, end, precision, ..., n = 1L)
start , end 
A pair of isoyearweekday vectors. These will be recycled to their common size. 
precision 
One of:

... 
These dots are for future extensions and must be empty. 
n 
A single positive integer specifying a multiple of 
An integer representing the number of precision
units between
start
and end
.
# Compute the number of whole ISO years between two dates
x < iso_year_week_day(2001, 1, 2)
y < iso_year_week_day(2021, 1, c(1, 3))
calendar_count_between(x, y, "year")