It is not a bug. Y2K strikes again, a couple of years late.
On Fri, May 23, 2008 at 7:17 AM, Kåre Edvardsen <[EMAIL PROTECTED]> wrote: > I'm on an Ubuntu Linux PC, and get the same wrong result as you. > I could not work out what the description of '%y' really ment, so I did > not realize this was operating system specific in this sense. Anyway, > I'll find a way to work around this bug. > > Have a nice weekend, > Kare > > > On Fri, 2008-05-23 at 10:41 +0100, Prof Brian Ripley wrote: > > > On my Linux box: > > > > > strptime("010169", format = "%d%m%y") > > [1] "1969-01-01" > > > strptime("311268", format = "%d%m%y") > > [1] "2068-12-31" > > > > >From the help page: > > > > '%y' Year without century (00-99). If you use this on input, which > > century you get is system-specific. So don't! Often values > > up to 69 (or 68) are prefixed by 20 and 70 (or 69) to 99 by > > 19. > > > > If all else fails, read the documentation (but the posting guide asks you > > to do that before posting). Elsewhere on that help page it refers you to > > your OS documentation -- the posting guide asked for your OS 'at a > > minimum', but as you didn't follow it so we have no idea which you used. > > > > On Fri, 23 May 2008, Kåre Edvardsen wrote: > > > > > Hi r-helpers... > > > > > > Why do I get this strange huge jump of 36524 days when changing > "origin" > > > from 1969-01-01 to 1968-12-31. It should still be close to zero! This > > > really messes up my calculations of follow-up times in my analyses. > > > > > >> julian(strptime("010169", format = "%d%m%y"),origin = > > > as.Date("1969-01-01")) > > >> Time difference of -0.04166667 days > > > > > >> julian(strptime("311268", format = "%d%m%y"),origin = > > > as.Date("1968-12-31")) > > >> Time difference of 36524.96 days > > > > > > > > > Cheers, > > > Kare > > > > > > [[alternative HTML version deleted]] > > > > > > ______________________________________________ > > > R-help@r-project.org mailing list > > > https://stat.ethz.ch/mailman/listinfo/r-help > > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> > > > and provide commented, minimal, self-contained, reproducible code. > > > > > > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem you are trying to solve? [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.