messydates (version 0.4.1)

operate: Arithmetic operations for messydates

Description

These operations allow users to add or subtract dates messydate objects. Messydate objects include incomplete or uncertain dates, ranges of dates, negative dates, and date sets.

Usage

# S3 method for mdate
+(e1, e2)
# S3 method for mdate
-(e1, e2)

Value

A messydates vector

Arguments

e1

An mdate or date object.

e2

An mdate, date, or numeric object. Must be a scalar.

Examples

# \donttest{
d <- as_messydate(c("2008-03-25", "-2012-02-27", "2001-01?", "~2001",
"2001-01-01..2001-02-02", "{2001-01-01,2001-02-02}",
"2008-XX-31", "..2002-02-03", "2001-01-03..", "28 BC"))
tibble::tibble(date = d, add = d + 1, subtract = d - 1)
tibble::tibble(date = d, add = d + "1 year", subtract = d - "1 year")
as_messydate("2001-01-01") + as_messydate("2001-01-02..2001-01-04")
as_messydate("2001-01-01") + as_messydate("2001-01-03")
as_messydate("2001-01-01..2001-01-04") - as_messydate("2001-01-02")
#as_messydate("2001-01-01") - as_messydate("2001-01-03")
# }