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\alias{as.POSIXct}
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\alias{as.POSIXct}
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\alias{as.POSIXct.default}
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\alias{as.POSIXct.default}
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\alias{as.POSIXct.POSIXlt}
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\alias{as.POSIXct.POSIXlt}
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\alias{as.POSIXct.date}
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\alias{as.POSIXct.date}
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\alias{as.POSIXct.dates}
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\alias{as.POSIXct.dates}
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\alias{as.POSIXct.Date}
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\alias{as.POSIXlt}
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\alias{as.POSIXlt}
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\title{Date-time Conversion Functions}
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\title{Date-time Conversion Functions}
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\description{
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\description{
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Functions to manipulate objects of classes \code{"POSIXlt"} and
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Functions to manipulate objects of classes \code{"POSIXlt"} and
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}
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}
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\details{
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\details{
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The \code{as.POSIX*} functions convert an object to one of the two
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The \code{as.POSIX*} functions convert an object to one of the two
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classes used to represent date/times (calendar dates plus time to the
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classes used to represent date/times (calendar dates plus time to the
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nearest second). They can take convert a wide variety of objects,
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nearest second). They can take convert a wide variety of objects,
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including objects of the other class and of classes \code{"date"}
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including objects of the other class and of classes \code{"Date"},
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(from package \pkg{\link[date:as.date]{date}} or
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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}}), \code{"chron"} and
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\pkg{\link[survival:as.date]{survival}}), \code{"chron"} and
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\code{"dates"} (from package \pkg{\link[chron]{chron}}) to these
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\code{"dates"} (from package \pkg{\link[chron]{chron}}) to these
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classes. Dates are treated as being at midnight UTC.
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classes. They can also convert character strings of the formats
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They can also convert character strings of the formats
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\code{"2001-02-03"} and \code{"2001/02/03"} optionally followed by
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\code{"2001-02-03"} and \code{"2001/02/03"} optionally followed by
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white space and a time in the format \code{"14:52"} or
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white space and a time in the format \code{"14:52"} or
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\code{"14:52:03"}. (Formats such as \code{"01/02/03"} are ambiguous
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\code{"14:52:03"}. (Formats such as \code{"01/02/03"} are ambiguous
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but can be converted via a format specification by
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but can be converted via a format specification by
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\code{\link{strptime}}.)
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\code{\link{strptime}}.)
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