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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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  the same clock time each day.  (\code{"week"} ignores DST (it is a
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  the same clock time each day.  \code{"week"} ignores DST (it is a
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  period of 144 hours), but \code{"7 DSTdays"}) can be used as an
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  period of 144 hours), but \code{"7 DSTdays"} can be used as an
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  alternative.  \code{"month"} and \code{"year"} allow for DST.)
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  alternative.  \code{"month"} and \code{"year"} allow for DST.
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  The \link{time zone} of the result is taken from \code{from}: remember
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  The \link{time zone} of the result is taken from \code{from}: remember
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  that GMT means UTC (and not the time zone of Greenwich, England) and so
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  that GMT means UTC (and not the time zone of Greenwich, England) and so
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  does not have daylight savings time.
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  does not have daylight savings time.
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