\Header{cut.POSIXt}{Convert a Date or Date-Time Object to a Factor}
\alias{cut.Date}{cut.POSIXt}
\keyword{manip}{cut.POSIXt}
\keyword{chron}{cut.POSIXt}
\begin{Description}\relax
Method for \code{\Link{cut}} applied to date-time objects.
\end{Description}
\begin{Usage}
\begin{verbatim}
## S3 method for class 'POSIXt':
cut(x, breaks, labels = NULL, start.on.monday = TRUE,
    right = FALSE, ...)

## S3 method for class 'Date':
cut(x, breaks, labels = NULL, start.on.monday = TRUE,
    right = FALSE, ...)
\end{verbatim}
\end{Usage}
\begin{Arguments}
\begin{ldescription}
\item[\code{x}] an object inheriting from class \code{"POSIXt"} or \code{"Date"}.
\item[\code{breaks}] a vector of cut points \emph{or} number giving the number of
intervals which \code{x} is to be cut into \emph{or} an
interval specification, one of \code{"sec"}, \code{"min"},
\code{"hour"}, \code{"day"}, \code{"DSTday"}, \code{"week"},
\code{"month"} or \code{"year"}, optionally preceded by an integer
and a space, or followed by \code{"s"}.  For \code{"Date"} objects
only \code{"day"}, \code{"week"}, \code{"month"} and \code{"year"}
are allowed.

\item[\code{labels}] labels for the levels of the resulting category.  By default,
labels are constructed from the left-hand end of the intervals
(which are include for the default value of \code{right}).  If
\code{labels = FALSE}, simple integer codes are returned instead
of a factor.

\item[\code{start.on.monday}] logical. If \code{breaks = "weeks"}, should the
week start on Mondays or Sundays?
\item[\code{right, ...}] arguments to be passed to or from other methods.
\end{ldescription}
\end{Arguments}
\begin{Value}
A factor is returned, unless \code{labels = FALSE} which returns
the integer level codes.
\end{Value}
\begin{SeeAlso}\relax
\code{\Link{seq.POSIXt}}, \code{\Link{seq.Date}}, \code{\Link{cut}}
\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
## random dates in a 10-week period
cut(ISOdate(2001, 1, 1) + 70*86400*runif(100), "weeks")
cut(as.Date("2001/1/1") + 70*runif(100), "weeks")
\end{ExampleCode}
\end{Examples}

