operate_set: Set operations for messy dates

In messydates: A Flexible Class for Messy Dates

Set operations for messy dates

Description

Performs intersection (⁠%intersect%⁠) and union (⁠%union%⁠) on the dates or date-times implied by messy date class objects, treating each as the (day-granularity) set of dates it expands to. Both return a plain character vector of the individual member dates.

For a union that instead returns an mdate object in its most succinct (contracted) notation, e.g. a range rather than a list of every day within it, use + (see ?operate_arithmetic) instead.

Usage

e1 %intersect% e2

## S3 method for class 'mdate'
e1 %intersect% e2

e1 %union% e2

## S3 method for class 'mdate'
e1 %union% e2

Arguments

e1, e2

Messy date or other class objects

Value

A vector of the same mode for ⁠%intersect%⁠, or a common mode for ⁠%union%⁠.

Functions

• %intersect% : Find intersection of sets of messy dates

• %union% : Find union of sets of messy dates

Examples

as_messydate("2012-01-01..2012-01-20") %intersect% as_messydate("2012-01")
as_messydate("2012-01-01..2012-01-20") %union% as_messydate("2012-01")

messydates documentation built on July 17, 2026, 1:07 a.m.