I'm having problems entering dates and times around when daylight savings time starts. If I type (on R 1.8.1 on Gentoo Linux)
> ISOdatetime(2004,4,4,0:4,0,0,"GMT") [1] "2004-04-03 19:00:00 EST" "2004-04-03 20:00:00 EST" [3] "2004-04-03 22:00:00 EST" "2004-04-03 22:00:00 EST" [5] "2004-04-03 23:00:00 EST" Giving the times between 2:00 and 3:00 GMT on 4 April which are all off by one hour. I tried setting TZ (to "Canada/Eastern") but didn't see any change. For comparison I tried the same thing in R 1.8.1 for Windows and got a similar error, but the one hour that is wrong is one hour early, rather than one hour late: > ISOdatetime(2004,4,4,0:4,0,0,"GMT") [1] "2004-04-03 19:00:00 Eastern Standard Time" [2] "2004-04-03 20:00:00 Eastern Standard Time" [3] "2004-04-03 20:00:00 Eastern Standard Time" [4] "2004-04-03 22:00:00 Eastern Standard Time" [5] "2004-04-03 23:00:00 Eastern Standard Time" If I try the same thing on R 1.9 for OS X, I get the correct result, that is one hour intervals. So far I've been able to enter times correctly for this period by using chron, multiplying by the number of seconds in a day and forcing the resulting number to be a POSIXct, but this seems too involved and probably unreliable. Thanks for any suggestions, Ian Kennedy ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
