A Simple S3-Class for Year-Month Dates

Source: R/date_ym.R

A simple data type for storing year-month dates in a human readable integer format, e.g.: December 2012 is stored as 201212. Supports simple arithmetic operations such as + and - as well formatting.

date_ym(y, m)

is_date_ym(x)

as_date_ym(x)

Arguments

y

year
m

month (optional)
x

any R object

Value

date_ym returns an object of type date_ym

is_date_ym returns TRUE or FALSE depending on whether its argument is of type date_ym or not.

as_date_ym attempts to coerce its argument to date_ym

See also

format.date_ym(), seq.date_ym(), date_xx_arithmetic()

Other date_xx subclasses: date_yq(), date_yw(), date_y()

Examples

date_ym(2013, 12)
#> [1] "2013-M12"

as_date_ym(201612)
#> [1] "2016-M12"