
interval
object.Interval-class
object with the specified start and end
dates. If the start date occurs before the end date, the interval will be positive.
Otherwise, it will be negative.interval(start, end, tzone = attr(start, "tzone"))is.interval(x)
as.period
, as.duration
. Since an interval is
anchored to a fixed history of time, both the exact number of seconds that passed
and the number of variable length time units that occurred during the interval can be
calculated.%--%
Creates an interval that covers the range spanned
by two dates. It replaces the
original behavior of lubridate, which created an interval by default whenever
two date-times were subtracted.
Interval-class
, as.interval
interval(ymd(20090201), ymd(20090101))
# 2009-02-01 UTC--2009-01-01 UTC
date1 <- as.POSIXct("2009-03-08 01:59:59")
date2 <- as.POSIXct("2000-02-29 12:00:00")
interval(date2, date1)
# 2000-02-29 12:00:00 CST--2009-03-08 01:59:59 CST
interval(date1, date2)
# 2009-03-08 01:59:59 CST--2000-02-29 12:00:00 CST
span <- interval(ymd(20090101), ymd(20090201))
# 2009-01-01 UTC--2009-02-01 UTC
is.interval(period(months= 1, days = 15)) # FALSE
is.interval(interval(ymd(20090801), ymd(20090809))) # TRUE
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