You misunderstand the role of timezones. as.POSIXct(Sys.Date())
is in UTC, as documented. as.POSIXlt(Sys.Date()) does not have a timezone (POSIXlt objects do not need one). as.POSIXct(as.POSIXlt(Sys.Date())) means as.POSIXct(as.POSIXlt(Sys.Date()), tz="") which is asking to interpret this in the local timezone. I've expanded the documentation, but I see no sign you had studied it so that it unlikely to help you. On Fri, 1 Sep 2006, [EMAIL PROTECTED] wrote: > Full_Name: Erich Neuwirth > Version: 2.3.1 > OS: Windows XP, Linux > Submission from: (NULL) (131.130.135.167) > > > Converting Sys.Date() to a POSIX compliant time type in different ways > produces inconsistent results: > > Sys.date() > [1] "2006-09-01" > > as.POSIXct(Sys.Date()) > [1] "2006-09-01 02:00:00 CEST" > > as.POSIXlt(Sys.Date()) > [1] "2006-09-01" > > as.POSIXct(as.POSIXlt(Sys.Date())) > [1] "2006-09-01 01:00:00 CEST" > > Applying as.POSIXct directly or first applying as.POSIXlt and then > applying as.POSIXct produces different results. > > This happens on Linux with timezone "CEST" > > Sys.time() > [1] "2006-09-01 11:03:36 CEST" > and on Windows with timezone "W. Europe Daylight Time" > > Sys.time() > [1] "2006-09-01 11:11:15 W. Europe Daylight Time" > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- 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 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
