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\item A number, taken to be in seconds.
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\item A number, taken to be in seconds.
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\item An object of class \code{\link{difftime}}
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\item An object of class \code{\link{difftime}}
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\item A character string, containing one of \code{"sec"},
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\item A character string, containing one of \code{"sec"},
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\code{"min"}, \code{"hour"}, \code{"day"}, \code{"DSTday"},
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\code{"min"}, \code{"hour"}, \code{"day"}, \code{"DSTday"},
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\code{"week"}, \code{"month"}, \code{"quarter"} or \code{"year"}, or a
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\code{"week"}, \code{"month"}, \code{"quarter"} or \code{"year"}, or a
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\code{\link{pmatch}()}able abbreviaton of these.
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\code{\link{pmatch}()}able abbreviation of these.
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This can optionally be preceded by a (positive or negative) integer
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This can optionally be preceded by a (positive or negative) integer
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and a space, or followed by \code{"s"}.
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and a space, or followed by \code{"s"}.
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}
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}
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The difference between \code{"day"} and \code{"DSTday"} is that the
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The difference between \code{"day"} and \code{"DSTday"} is that the
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former ignores changes to/from daylight savings time and the latter takes
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former ignores changes to/from daylight savings time and the latter takes
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