[R] ISOdate returns incorrect date?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Nov 19 18:03:17 CET 2003
For the record, ISOdate *is* giving the right answer, a POSIXct object.
The problem is in printing, where there was a simple coding bug: is_year
was applied to the POSIX `year' which is year-1900.
It's always worth distinguishing between the actual value and its printed
On Wed, 19 Nov 2003, Prof Brian Ripley wrote:
> Well, one clue is that date is before the modern era, and most OSes only
> go back to 1902. Some only go back to 1970! I suspect the OS does not
> know that 1900 was not a leap year.
> On Wed, 19 Nov 2003, Heiko Schaefer wrote:
> > Does this really work for you? I still get:
> > > ISOdate(1900,6,16)
> >  "1900-06-15 14:00:00 Westeuropäische Sommerzeit"
> > > ISOdate(1900,6,16,tz="")
> >  "1900-06-15 12:00:00 Westeuropäische Sommerzeit"
> > Obviously the time son influences the time, but it can
> > Not possibly account for the difference of a full day?!
> > Still puzzled...
> > Heiko
Brian D. Ripley, ripley at stats.ox.ac.uk
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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