Hi,
if you look at my example in recent thread "Rép : [R] problem with
as.POSIXct and daylight savings time", it appears that tz argument is
used by as.POSIX.ct
Denis Chabot
Le 09-07-20 à 00:00, Remko Duursma a écrit :
as.POSIXct.dates does not make use of tz:
Ok, but it is supposed to, right? Or maybe the documentation can be
updated, because ?as.POSIXct does seem to imply the timezone is used
(as it is for other methods of as.POSIXct).
thanks,
Remko
-------------------------------------------------
Remko Duursma
Post-Doctoral Fellow
Centre for Plants and the Environment
University of Western Sydney
Hawkesbury Campus
Richmond NSW 2753
Dept of Biological Science
Macquarie University
North Ryde NSW 2109
Australia
Mobile: +61 (0)422 096908
On Mon, Jul 20, 2009 at 1:41 PM, Gabor
Grothendieck<ggrothendi...@gmail.com> wrote:
as.POSIXct.dates does not make use of tz:
as.POSIXct.dates
function (x, ...)
{
if (inherits(x, "dates")) {
z <- attr(x, "origin")
x <- as.numeric(x) * 86400
if (length(z) == 3L && is.numeric(z))
x <- x + as.numeric(ISOdate(z[3L], z[1L], z[2L],
0))
return(structure(x, class = c("POSIXt", "POSIXct")))
}
else stop(gettextf("'%s' is not a \"dates\" object",
deparse(substitute(x))))
}
<environment: namespace:base>
On Sun, Jul 19, 2009 at 11:30 PM, Remko Duursma<remkoduur...@gmail.com
> wrote:
Dear R-helpers,
I have a problem converting an object made with the 'chron' function
to a POSIXct object:
# Make date based on DOY
dat <- chron(dates=232, origin.=c(month=1, day=1, year=2008))
dat
#[1] 08/20/08
# Converting to POSIXct uses current timezone (Sydney):
as.POSIXct(dat)
#[1] "2008-08-20 10:00:00 EST"
# Setting GMT timezone has no effect?
as.POSIXct(dat, tz="GMT")
#[1] "2008-08-20 10:00:00 EST"
# But to POSIXlt works fine:
as.POSIXlt(dat, tz="GMT")
#[1] "2008-08-20 GMT"
Is this behavior expected? If so, can you explain why?
thanks for your help,
Remko
-------------------------------------------------
Remko Duursma
Post-Doctoral Fellow
Centre for Plants and the Environment
University of Western Sydney
Hawkesbury Campus
Richmond NSW 2753
Dept of Biological Science
Macquarie University
North Ryde NSW 2109
Australia
Mobile: +61 (0)422 096908
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and provide commented, minimal, self-contained, reproducible code.
