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

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

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:

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"

News

dint 2.0.0

breaking: formatting date_xx objects now uses placeholders similar to base::strptime() (e.g %Y, %m, %q, etc...) instead of presets. The new implementation is also noticably faster than the old.
breaking: all first_day_of_*() and format_date_y*() functions now have shorter names: first_of_*() and format_y*(). The original names will still work until the next release but give a deprecation warning.
Added support for c(), min(), max(), range()
You can now direclty supply a numeric year to first_of_year() and last_of_year() (e.g. first_of_year(2018))
added date_yw for storing isoweeks and modified existing funtions to accomodate for them.
added [ method for date_xx objects that preserves class attribute when subsetting
%y+% / %y-% can add/subtract years from date_xx objects
added the predicates, is_first_of_quarter(), is_last_of_quarter(), and is_quarter_bounds().
seq() methods now support a by argument