Great. Thanks for confirmation. Cheers, Mike.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ---------------------------- Message: 16 Date: Tue, 25 Oct 2005 21:33:54 +0100 (BST) From: Prof Brian Ripley <[EMAIL PROTECTED]> Subject: Re: [Rd] strptime problem for 2004-10-03 02:00:00 To: Michael Sumner <[EMAIL PROTECTED]> Cc: r-devel@stat.math.ethz.ch Message-ID: <[EMAIL PROTECTED]> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed It's a bug, a rather rare one. 2004-10-03 02:00:00 does not exist in your time zone, and in trying to find out if the time is on DST or not it has failed to find out. It needs to be told that GMT is never on DST so not to bother. On Linux, running R with TZ="GMT" set should fix this. Windows is harder to control since it does not distinguish the UK timezone from GMT. There is a bugfix now in R-devel. It may migrate to R-patched in due course. On Tue, 25 Oct 2005, Michael Sumner wrote: >> Hello, I at first thought this was a system or locale issue, but since >> it occurs on >> both Windows and Linux and only for 2004 (AFAIK) I report it. >> >> I have a problem with as.POSIXct for the hour between >> "2004-10-03 02:00:00 GMT" and "2004-10-03 02:59:59 GMT". >> >> In short, the 2 AM (GMT) hour in 2004 (but not in other years) is >> interpreted as 1 AM by strptime: >> (I use ISOdatetime as a convenience). >> >> ## Windows XP >> >> ISOdatetime(2004, 10, 3, 2, 0, 0, tz = "GMT") >> ##[1] "2004-10-03 01:00:00 GMT" >> ISOdatetime(2004, 10, 3, 1, 0, 0, tz = "GMT") >> ##[1] "2004-10-03 01:00:00 GMT" >> >> ISOdatetime(2005, 10, 3, 2, 0, 0, tz = "GMT") >> ##[1] "2005-10-03 02:00:00 GMT" >> ISOdatetime(2005, 10, 3, 1, 0, 0, tz = "GMT") >> ## [1] "2005-10-03 01:00:00 GMT" >> > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
