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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