This is a year-quarter-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 quarters).

## Usage

```
# S3 method for clock_year_quarter_day
calendar_count_between(start, end, precision, ..., n = 1L)
```

## Arguments

- start, end
`[clock_year_quarter_day]`

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

- precision
`[character(1)]`

One of:

`"year"`

`"quarter"`

- ...
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.

## Examples

```
# Compute the number of whole quarters between two dates
x <- year_quarter_day(2020, 3, 91)
y <- year_quarter_day(2025, 4, c(90, 92))
calendar_count_between(x, y, "quarter")
#> [1] 20 21
# Note that this is not always the same as the number of whole 3 month
# periods between two dates
x <- as_year_month_day(x)
y <- as_year_month_day(y)
calendar_count_between(x, y, "month", n = 3)
#> [1] 21 21
```