Counting: year-month-day

This is a year-month-day 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).

Usage

# S3 method for class 'clock_year_month_day'
calendar_count_between(start, end, precision, ..., n = 1L)

Arguments

start, end

[clock_year_month_day]

A pair of year-month-day vectors. These will be recycled to their common size.

precision

[character(1)]

One of:

• "year"

• "quarter"

• "month"

...

These dots are for future extensions and must be empty.

n

[positive integer(1)]

A single positive integer specifying a multiple of precision to use.

Value

An integer representing the number of precision units between start and end.

Details

"quarter" is equivalent to "month" precision with n set to n * 3L.

Examples

# 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")
#> [1] 20

# 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")
#> [1] 2 2 3