year_month: Year month/year quarter/year

In marberts/ppd: Prices Production and Development

Description

Turn dates into year months/year quarters/years.

Usage

year_month(x, shift = 0, frac = 0)

year_quarter(x, shift = 0, frac = 0)

year(x, shift = 0, frac = 0)

Arguments

x	A date, or something that can be coerced into one.
shift	Number of months to shift up/down dates in x (0 by default).
frac	Should calendar periods be formatted as the first day in a period (0, the default), the last day (1), or some point in between?

Value

A vector of dates.

See Also

See complete_quarters for an application, and calendar_period for non-standard calendar periods.

Examples

# Turn dates into year-months
x <- as.Date(c('2018-01-15', '2018-01-03', '2018-02-24'))
year_month(x)

# Turn year-months into year-quarters
x <- as.Date(c('2018-01-01', '2018-02-01', '2018-04-01'))
year_quarter(x)

# Format as the last day in a quarter
year_quarter(x, frac = 1)

## Not run: 
# This can also be done with zoo
library(zoo)
as.Date(as.yearqtr(x))
as.Date(as.yearqtr(x), frac = 1)

## End(Not run)

# Find periods one month ago
match(year_month(x, -1), year_month(x))

marberts/ppd documentation built on March 27, 2020, 7:21 p.m.