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\title{Is x an interval object?}
Is x an interval object?
\value{TRUE if x is an interval object, FALSE otherwise.}
\seealso{\code{\link{is.instant}}, \code{\link{is.timespan}}, \code{\link{is.period}},
\code{\link{is.duration}}, \code{\link{interval}}}
\item{x}{an R object}
\examples{is.interval(new_period(months= 1, days = 15)) # FALSE
is.interval(new_interval(ymd(20090801), ymd(20090809))) # TRUE}
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