On Fri, 1 Sep 2006, Peter Dalgaard wrote:

[...]

> I'm not sure any of this is actual bugs (Brian will tell us soon
> enough), but it does appear at least to be underdocumented.

(Your message crossed mine.)

I think it is not a bug and actually explicitly documented in ?as.POSIXlt.  
What may help those who have not read that documentation is to stick the 
UTC timezone on the conversion to POSIXlt.  Getting

> as.POSIXlt(Sys.Date())
[1] "2006-09-01 UTC"
> as.POSIXct(as.POSIXlt(Sys.Date()))
[1] "2006-09-01 UTC"
> as.POSIXct(as.POSIXlt(Sys.Date()), tz="")
[1] "2006-09-01 01:00:00 GMT Daylight Time"

might be helpful to non-readers.

-- 
Brian D. Ripley,                  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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