lubridate (version 0.1)

subtract_dates: Subtraction for the duration (i...

Description

Subtraction for the duration (i.e, difftime), period, and interval classes.

Usage

subtract_dates(e1, e2)

Arguments

e1

a duration(i.e. difftime), period, interval, POSIXt, or Date object

e2

a duration(i.e. difftime), period, interval, POSIXt, or Date object

Value

• a new duration(i.e. difftime), period, interval, POSIXt, or Date object, depending on e1 and e2

Details

The subtraction methods returns an interval object when a POSIXt or Date object is subtracted from another POSIXt or Date object. To retrieve this difference as a difftime, use as.duration. To retrieve it as a period use as.period.

Since a specific number of seconds exists between two dates, the duration returned will not include unspecific time units such as years and months. See duration for more details.

Examples

x <- new_duration(day = 1)
now() - x
-x
x - x
as.Date("2009-08-02") - as.Date("2008-11-25")