On Fri, 11 Jan 2002 jutans@utans.u-net.com wrote:
> Full_Name: Joachim Utans
> Version: 1.4.0
> OS: NT4 sp4
> Submission from: (NULL) (195.42.238.80)
>
>
> seq.POSIXt(..., by="day") apparently has problems steping over
> a change in daylight savings time; 2001-10-28 appears twice,
> the last day, 2001-10-30, is missing
Take a closer look. It is stepping by days, but that means by 24-hour
days. Look at it in GMT (there is no such time zone as GMT Daylight Time,
Bill Gates!)
z <-
seq(as.POSIXct("2001-10-26"),as.POSIXct("2001-10-30"),by="day")> format(z, tz="GMT")
[1] "2001-10-25 23:00:00" "2001-10-26 23:00:00"
"2001-10-27 23:00:00"
[4] "2001-10-28 23:00:00" "2001-10-29 23:00:00"
which is correct.
> >
seq(as.POSIXct("2001-10-26"),as.POSIXct("2001-10-30"),by="day")
> [1] "2001-10-26 00:00:00 GMT Daylight Time" "2001-10-27
00:00:00 GMT Daylight
> Time" "2001-10-28 00:00:00 GMT Daylight Time"
> [4] "2001-10-28 23:00:00 GMT Standard Time" "2001-10-29
23:00:00 GMT Standard
> Time"
--
Brian D. Ripley, ripley@stats.ox.ac.uk
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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