yeardaycountbetween {clock}  R Documentation 
This is a yearday method for the calendar_count_between()
generic.
It counts the number of precision
units between start
and end
(i.e., the number of years).
## S3 method for class 'clock_year_day'
calendar_count_between(start, end, precision, ..., n = 1L)
start, end 
A pair of yearday 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 an individual's age in years
x < year_day(2001, 100)
y < year_day(2021, c(99, 101))
calendar_count_between(x, y, "year")
# Or in a whole number multiple of years
calendar_count_between(x, y, "year", n = 3)