# Boundaries: year-month-weekday

Source:`R/gregorian-year-month-weekday.R`

`year-month-weekday-boundary.Rd`

This is a year-month-weekday method for the `calendar_start()`

and
`calendar_end()`

generics. They adjust components of a calendar to the
start or end of a specified `precision`

.

This method is restricted to only `"year"`

and `"month"`

`precision`

s, and
`x`

can't be more precise than month precision. Computing the "start" of
a day precision year-month-weekday object isn't defined because
a year-month-weekday with `day = 1, index = 1`

doesn't necessarily occur
earlier (chronologically) than `day = 2, index = 1`

. Because of these
restrictions, this method isn't particularly useful, but is included for
completeness.

## Usage

```
# S3 method for clock_year_month_weekday
calendar_start(x, precision)
# S3 method for clock_year_month_weekday
calendar_end(x, precision)
```

## Arguments

- x
`[clock_year_month_weekday]`

A year-month-weekday vector.

- precision
`[character(1)]`

One of:

`"year"`

`"month"`

## Examples

```
# Month precision
x <- year_month_weekday(2019, 1:5)
x
#> <year_month_weekday<month>[5]>
#> [1] "2019-01" "2019-02" "2019-03" "2019-04" "2019-05"
# Compute the last month of the year
calendar_end(x, "year")
#> <year_month_weekday<month>[5]>
#> [1] "2019-12" "2019-12" "2019-12" "2019-12" "2019-12"
```