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\alias{as.Date}
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\alias{as.Date}
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\alias{as.Date.character}
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\alias{as.Date.character}
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\alias{as.Date.default}
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\alias{as.Date.default}
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\alias{as.Date.factor}
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\alias{as.Date.factor}
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\alias{as.Date.POSIXct}
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\alias{as.Date.POSIXct}
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\alias{as.Date.date}
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\alias{as.Date.dates}
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\title{Date Conversion Functions to and from Character}
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\title{Date Conversion Functions to and from Character}
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\description{
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\description{
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  Functions to convert between character representations and objects of
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  Functions to convert between character representations and objects of
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  classes \code{"Date"} representing calendar dates and times.
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  classes \code{"Date"} representing calendar dates and times.
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  and months.
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  and months.
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  The \code{as.Date} methods accept character strings, factors, logical
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  The \code{as.Date} methods accept character strings, factors, logical
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  \code{NA} and objects of class \code{"\link{POSIXct}"}, which are
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  \code{NA} and objects of class \code{"\link{POSIXct}"}, which are
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  converted to days by ignoring the time to be midnight in the
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  converted to days by ignoring the time to be midnight in the
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  representation of the time in UTC.
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  representation of the time in UTC.  Also objects of class
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  \code{"date"} (from package \pkg{\link[date:as.date]{date}} or
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  \pkg{\link[survival:as.date]{survival}}) and
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  \code{"dates"} (from package \pkg{\link[chron]{chron}}).
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  The \code{format} and \code{as.character} methods ignore any
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  The \code{format} and \code{as.character} methods ignore any
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  fractional part of the date.
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  fractional part of the date.
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}
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}
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\value{
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\value{