dint

A Toolkit for Year-Quarter, Year-Month and Year-Isoweek Dates

S3 classes and methods to create and work with year-quarter and year-month vectors. Basic arithmetic operations (such as adding and subtracting) are supported, as well as formatting and converting to and from standard R Date types.

Installation

Install the release version of dint from CRAN:

install.packages("dint")

Or install the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("s-fleck/dint")

Example

library(dint)

# creation
q <- date_yq(2014, 4)
m <- as_date_ym(201412)
w <- as_date_yw(as.Date("2017-01-01"))

# printing
print(q)
#> [1] "2014-Q4"
print(m)
#> [1] "2014-M12"
print(w)  # isoweeks do not follow calender years!
#> [1] "2016-W52"

# arithmetic operations
# quarters
q
#> [1] "2014-Q4"
q + 1
#> [1] "2015-Q1"
seq(q -2, q + 2)
#> [1] "2014-Q2" "2014-Q3" "2014-Q4" "2015-Q1" "2015-Q2"


# months
m
#> [1] "2014-M12"
m + 1
#> [1] "2015-M01"
seq(m -2, m + 2)
#> [1] "2014-M10" "2014-M11" "2014-M12" "2015-M01" "2015-M02"


# formatting
format(q)
#> [1] "2014-Q4"
format(q, "%Y.%q")
#> [1] "2014.4"
format(q, "%y.%q")
#> [1] "14.4"
format(m)
#> [1] "2014-M12"


# get start and end of period
last_of_quarter(q)
#> [1] "2014-12-31"
first_of_quarter(q)
#> [1] "2014-10-01"
first_of_month(Sys.Date())
#> [1] "2018-09-01"
first_of_isoweek(w)
#> [1] "2016-12-26"
last_of_isoweek(w)
#> [1] "2017-01-01"