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Rev 68948 Rev 85065
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\special{x + date}
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\special{x + date}
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\special{date - x}
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\special{date - x}
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\special{date1 lop date2}
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\special{date1 lop date2}
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}
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}
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\arguments{
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\arguments{
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  \item{date}{date objects}
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  \item{date}{an object of class \code{"\link{Date}"}.}
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  \item{date1, date2}{date objects or character vectors.  (Character
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  \item{date1, date2}{date objects or character vectors.  (Character
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    vectors are converted by \code{\link{as.Date}}.)}
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    vectors are converted by \code{\link{as.Date}}.)}
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  \item{x}{a numeric vector (in days) \emph{or} an object of class
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  \item{x}{a numeric vector (in days) \emph{or} an object of class
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    \code{"\link{difftime}"}, rounded to the nearest whole day.}
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    \code{"\link{difftime}"}, rounded to the nearest whole day.}
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  \item{lop}{One of \code{==}, \code{!=}, \code{<}, \code{<=}, \code{>}
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  \item{lop}{one of \code{==}, \code{!=}, \code{<}, \code{<=}, \code{>}
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    or \code{>=}.}
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    or \code{>=}.}
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}
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}
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\details{
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\details{
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  \code{x} does not need to be integer if specified as a numeric vector,
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  \code{x} does not need to be integer if specified as a numeric vector,
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  but see the comments about fractional days in the help for
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  but see the comments about fractional days in the help for