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  used universally until the 20th century.  One of the
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  used universally until the 20th century.  One of the
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  re-interpretations assumed by ISO 8601:2004 is that there was a year
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  re-interpretations assumed by ISO 8601:2004 is that there was a year
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  zero, even though current year numbering (and zero) is a much later
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  zero, even though current year numbering (and zero) is a much later
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  concept (525 AD for year numbers from 1 AD).
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  concept (525 AD for year numbers from 1 AD).
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  Conversions from character strings of future times are speculative
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  Conversions between \code{"POSIXlt"} and \code{"POSIXct"} of future
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  except in UTC.  The main uncertainty is in the use of and transitions
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  times are speculative except in UTC.  The main uncertainty is in the
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  to/from DST (most systems will assume the continuation of current
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  use of and transitions to/from DST (most systems will assume the
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  rules but these can be changed at short notice).
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  continuation of current rules but these can be changed at short
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  notice).
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  If you want to extract specific aspects of a time (such as the day of
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  If you want to extract specific aspects of a time (such as the day of
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  the week) just convert it to class \code{"POSIXlt"} and extract the
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  the week) just convert it to class \code{"POSIXlt"} and extract the
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  relevant component(s) of the list, or if you want a character
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  relevant component(s) of the list, or if you want a character
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  representation (such as a named day of the week) use the
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  representation (such as a named day of the week) use the