yearmonthdaycountbetween {clock}  R Documentation 
This is a yearmonthday method for the calendar_count_between()
generic.
It counts the number of precision
units between start
and end
(i.e., the number of years or months).
## S3 method for class 'clock_year_month_day'
calendar_count_between(start, end, precision, ..., n = 1L)
start, end 
A pair of yearmonthday 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 
"quarter"
is equivalent to "month"
precision with n
set to n * 3L
.
An integer representing the number of precision
units between
start
and end
.
# Compute an individual's age in years
x < year_month_day(2001, 2, 4)
today < year_month_day(2021, 11, 30)
calendar_count_between(x, today, "year")
# Compute the number of months between two dates, taking
# into account the day of the month and time of day
x < year_month_day(2000, 4, 2, 5)
y < year_month_day(2000, 7, c(1, 2, 2), c(3, 4, 6))
calendar_count_between(x, y, "month")