lubridate (version 0.1)

new_interval: Create an interval object.

Description

Create an interval object.

Usage

new_interval(date1, date2)

Arguments

date1

a POSIXt or Date date-time object

date2

a POSIXt or Date date-time object

Value

• an interval object

Details

new_interval creates an interval object with the specified start and end dates. new_interval automatically assigns the date that occurs first as the start date and the date that occurs second as the end date.

Intervals are time spans bound by two real date-times. Intervals can be accurately converted to either period or duration objects using as.period, as.duration. Since an interval is anchored to a fixed history of time, both the number of seconds that passed as well as the length of common time units during that history can be calculated. Subtracting two date times automatically creates an interval object. Intervals display as the difftime between the two dates paired with the earlier, or beginning date.

See Also

interval, as.interval

Examples

new_interval(ymd(20090101), ymd(20090201))
# 31 days beginning at 2009-01-01

date1 <- as.POSIXct("2009-03-08 01:59:59")
date2 <- as.POSIXct("2000-02-29 12:00:00")
new_interval(date1, date2)
# 3294.583 days beginning at 2000-02-29 12:00:00
new_interval(date2, date1)
# 3294.583 days beginning at 2000-02-29 12:00:00

span <- new_interval(ymd(20090101), ymd(20090201))
# 31 days beginning at 2009-01-01
span - days(30)
# 1 days beginning at 2009-01-01
span + months(6)
# 211.9583 days beginning at 2009-01-01

span$start
# "2009-01-01 CST"make
span$end
# "2009-02-01 CST"}