> > On 18 May 2017, at 14:58 , Martyn Plummer <plumm...@iarc.fr> wrote: > > > >> On 18 May 2017, at 14:51, peter dalgaard <pda...@gmail.com> wrote:
> >>> On 18 May 2017, at 13:47 , Joris Meys <jorism...@gmail.com> wrote: > >>> > >>> Correction: Also dlt uses the default timezone, but POSIXlt is not > >>> recalculated whereas POSIXct is. Reason for that is the different way > >>> values are stored (hours, minutes, seconds as opposed to minutes from > >>> origin, as explained in my previous mail) > >>> > >> > >> I would suspect that there is something more subtle going on, New Zealand > >> time is 10, 11, or 12 hours from Central European, depending on time of > >> year (10 in our Summer, 12 in theirs and 11 during the overlap at both > >> ends, if you must know), and we are talking a 1 hour difference. > >> > >> However DST transitions were both in March/April, so that's not it. Maybe > >> a POSIX[lc]t expert can comment? > > > > If I change the month from December to June then I see the same phenomenon > > in my Europe/Paris time zone. The issue seems to be that, for the date > > chosen for the test, Summer/daylight savings time is in force in NZ and > > some other parts of the southern hemisphere , but not in the northern > > hemisphere. > > > Of course! I overlooked that the date in the test is the issue, not the > current date. (Let's blame that on the fact that Summer seems to have finally > arrived in Copenhagen...) > "svn praise" claims this test is due to Martin Maechler in r71742, so maybe > he knows how to fix it. (I wonder if he just used the current date at the > time, or actually thought that there would be no DST issues in December ;-) ) > -pd I think the former. This was about fixing a segmentation fault problem (thread from Dec 6, 2016, on the R-devel mailing list, starting here: https://stat.ethz.ch/pipermail/r-devel/2016-December/073448.html ) mostly, but the 2nd part of the regression test evidently needs more thought than I had put there. Being pretty "stretched" time wise currently, I'm happy for timezone-portable propositions to change the test. Martin ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
