On Wed, 17-May-2017 at 01:21PM +0200, Peter Dalgaard wrote:
|>
|> Anyways, you might want to
|>
|> a) move the discussion to R-devel
|> b) include your platform (hardware, OS) and time zone info
System: Host: MTA-V1-427894 Kernel: 3.19.0-32-generic x86_64 (64 bit gcc:
4.8.2)
Desktop: KDE Plasma 4.14.2 (Qt 4.8.6) Distro: Linux Mint 17.3 Rosa
Machine: System: innotek product: VirtualBox v: 1.2
Mobo: Oracle model: VirtualBox v: 1.2 Bios: innotek v: VirtualBox
date: 12/01/2006
CPU: Quad core Intel Core i7-4790 (-MCP-) cache: 8192 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3) bmips: 28734
clock speeds: max: 3591 MHz 1: 3591 MHz 2: 3591 MHz 3: 3591 MHz 4:
3591 MHz
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00:02.0
Display Server: X.Org 1.17.1 drivers: vboxvideo (unloaded:
fbdev,vesa) Resolution: 1920x1080 at 60.0hz
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Rendering: Yes
Audio: Card Intel 82801AA AC'97 Audio Controller driver: snd_intel8x0
ports: d100 d200 bus-ID: 00:05.0
Sound: Advanced Linux Sound Architecture v: k3.19.0-32-generic
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driver: e1000 v: 7.3.21-k8-NAPI port: d240 bus-ID: 00:08.0
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
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VBOX_HARDDISK size: 131.7GB
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ID-2: swap-1 size: 4.16GB used: 0.00GB (0%) fs: swap dev: /dev/sda5
RAID: No RAID devices: /proc/mdstat, md_mod kernel module present
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Info: Processes: 256 Uptime: 17:01 Memory: 3533.8/14955.3MB Init: Upstart
runlevel: 2 Gcc sys: 4.8.4
Client: Shell (bash 4.3.111) inxi: 2.2.28
Time zone: NZST
|> c) run the offending code lines "by hand" and show us the values
of format(dlt) and format(dct) so we can see what the problem is, something like
|>
|> dlt <- structure(
|> list(sec = 52, min = 59L, hour = 18L, mday = 6L, mon = 11L, year =
116L,
|> wday = 2L, yday = 340L, isdst = 0L, zone = "CET", gmtoff
= 3600L),
|> class = c("POSIXlt", "POSIXt"), tzone =
c("", "CET", "CEST"))
|> dlt$sec <- 10000 + 1:10
|> dct <- as.POSIXct(dlt)
|> cbind(format(dlt), format(dct))
> cbind(format(dlt), format(dct))
[,1] [,2]
[1,] "2016-12-06 21:45:41" "2016-12-06 22:45:41"
[2,] "2016-12-06 21:45:42" "2016-12-06 22:45:42"
[3,] "2016-12-06 21:45:43" "2016-12-06 22:45:43"
[4,] "2016-12-06 21:45:44" "2016-12-06 22:45:44"
[5,] "2016-12-06 21:45:45" "2016-12-06 22:45:45"
[6,] "2016-12-06 21:45:46" "2016-12-06 22:45:46"
[7,] "2016-12-06 21:45:47" "2016-12-06 22:45:47"
[8,] "2016-12-06 21:45:48" "2016-12-06 22:45:48"
[9,] "2016-12-06 21:45:49" "2016-12-06 22:45:49"
[10,] "2016-12-06 21:45:50" "2016-12-06
22:45:50">
--
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
___ Patrick Connolly
{~._.~} Great minds discuss ideas
_( Y )_ Average minds discuss events
(:_~*~_:) Small minds discuss people
(_)-(_) ..... Eleanor Roosevelt
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.
> On 18 May 2017, at 11:00 , Patrick Connolly <p_connolly at slingshot.co.nz> wrote: > > On Wed, 17-May-2017 at 01:21PM +0200, Peter Dalgaard wrote: > > |> > |> Anyways, you might want to > |> > |> a) move the discussion to R-devel > |> b) include your platform (hardware, OS) and time zone info > > System: Host: MTA-V1-427894 Kernel: 3.19.0-32-generic x86_64 (64 bit gcc: 4.8.2) > Desktop: KDE Plasma 4.14.2 (Qt 4.8.6) Distro: Linux Mint 17.3 RosaI suppose that'll do...> Time zone: NZST> > |> c) run the offending code lines "by hand" and show us the values of format(dlt) and format(dct) so we can see what the problem is, something like > |> > |> dlt <- structure( > |> list(sec = 52, min = 59L, hour = 18L, mday = 6L, mon = 11L, year = 116L, > |> wday = 2L, yday = 340L, isdst = 0L, zone = "CET", gmtoff = 3600L), > |> class = c("POSIXlt", "POSIXt"), tzone = c("", "CET", "CEST")) > |> dlt$sec <- 10000 + 1:10 > |> dct <- as.POSIXct(dlt) > |> cbind(format(dlt), format(dct)) > >> cbind(format(dlt), format(dct)) > [,1] [,2] > [1,] "2016-12-06 21:45:41" "2016-12-06 22:45:41" > [2,] "2016-12-06 21:45:42" "2016-12-06 22:45:42" > [3,] "2016-12-06 21:45:43" "2016-12-06 22:45:43" > [4,] "2016-12-06 21:45:44" "2016-12-06 22:45:44" > [5,] "2016-12-06 21:45:45" "2016-12-06 22:45:45" > [6,] "2016-12-06 21:45:46" "2016-12-06 22:45:46" > [7,] "2016-12-06 21:45:47" "2016-12-06 22:45:47" > [8,] "2016-12-06 21:45:48" "2016-12-06 22:45:48" > [9,] "2016-12-06 21:45:49" "2016-12-06 22:45:49" > [10,] "2016-12-06 21:45:50" "2016-12-06 22:45:50" >> >So exactly 1 hour out of whack. Is there a Daylight Saving Times issue, perchance? -pd> > -- > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~. > ___ Patrick Connolly > {~._.~} Great minds discuss ideas > _( Y )_ Average minds discuss events > (:_~*~_:) Small minds discuss people > (_)-(_) ..... Eleanor Roosevelt > > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.-- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Office: A 4.23 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
This has to do with your own timezone. If I run that code on my computer, both formats are correct. If I do this after Sys.setenv(TZ = "UTC") Then:> cbind(format(dlt), format(dct))[,1] [,2] [1,] "2016-12-06 21:45:41" "2016-12-06 20:45:41" [2,] "2016-12-06 21:45:42" "2016-12-06 20:45:42" The reason for that, is that dlt has a timezone set, but dct doesn't. To be correct, it only takes the first value "", which indicates "Use the default timezone of the locale".> attr(dlt, "tzone")[1] "" "CET" "CEST"> attr(dct, "tzone")[1] "" The thing is, in POSIXlt the timezone attribute is stored together with the actual values for hour, minute etc. in list format. Changing the timezone doesn't change those values, but it will change the time itself:> Sys.unsetenv("TZ") > dlt2 <- dlt > attr(dlt2,"tzone") <- "UTC" > dlt2[1] "2016-12-06 21:45:41 UTC" "2016-12-06 21:45:42 UTC" [3] "2016-12-06 21:45:43 UTC" "2016-12-06 21:45:44 UTC" in POSIXct the value doesn't change either, just the attribute. But this value is the number of seconds since the origin. So the time itself doesn't change, but you'll see a different hour.> dct[1] "2016-12-06 21:45:41 CET" "2016-12-06 21:45:42 CET" ...> attr(dct,"tzone") <- "UTC" > dct[1] "2016-12-06 20:45:41 UTC" "2016-12-06 20:45:42 UTC" [3] "2016-12-06 20:45:43 UTC" "2016-12-06 20:45:44 UTC" So what you see, is simply the result of your timezone settings on your computer. Cheers Joris On Thu, May 18, 2017 at 1:19 PM, peter dalgaard <pdalgd at gmail.com> wrote:> > > On 18 May 2017, at 11:00 , Patrick Connolly <p_connolly at slingshot.co.nz> > wrote: > > > > On Wed, 17-May-2017 at 01:21PM +0200, Peter Dalgaard wrote: > > > > |> > > |> Anyways, you might want to > > |> > > |> a) move the discussion to R-devel > > |> b) include your platform (hardware, OS) and time zone info > > > > System: Host: MTA-V1-427894 Kernel: 3.19.0-32-generic x86_64 (64 bit > gcc: 4.8.2) > > Desktop: KDE Plasma 4.14.2 (Qt 4.8.6) Distro: Linux Mint 17.3 > Rosa > > I suppose that'll do... > > > > Time zone: NZST > > > > > > > |> c) run the offending code lines "by hand" and show us the values of > format(dlt) and format(dct) so we can see what the problem is, something > like > > |> > > |> dlt <- structure( > > |> list(sec = 52, min = 59L, hour = 18L, mday = 6L, mon = 11L, year > = 116L, > > |> wday = 2L, yday = 340L, isdst = 0L, zone = "CET", gmtoff > 3600L), > > |> class = c("POSIXlt", "POSIXt"), tzone = c("", "CET", "CEST")) > > |> dlt$sec <- 10000 + 1:10 > > |> dct <- as.POSIXct(dlt) > > |> cbind(format(dlt), format(dct)) > > > >> cbind(format(dlt), format(dct)) > > [,1] [,2] > > [1,] "2016-12-06 21:45:41" "2016-12-06 22:45:41" > > [2,] "2016-12-06 21:45:42" "2016-12-06 22:45:42" > > [3,] "2016-12-06 21:45:43" "2016-12-06 22:45:43" > > [4,] "2016-12-06 21:45:44" "2016-12-06 22:45:44" > > [5,] "2016-12-06 21:45:45" "2016-12-06 22:45:45" > > [6,] "2016-12-06 21:45:46" "2016-12-06 22:45:46" > > [7,] "2016-12-06 21:45:47" "2016-12-06 22:45:47" > > [8,] "2016-12-06 21:45:48" "2016-12-06 22:45:48" > > [9,] "2016-12-06 21:45:49" "2016-12-06 22:45:49" > > [10,] "2016-12-06 21:45:50" "2016-12-06 22:45:50" > >> > > > > > So exactly 1 hour out of whack. Is there a Daylight Saving Times issue, > perchance? > > -pd > > > > > > -- > > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~. > > ___ Patrick Connolly > > {~._.~} Great minds discuss ideas > > _( Y )_ Average minds discuss events > > (:_~*~_:) Small minds discuss people > > (_)-(_) ..... Eleanor Roosevelt > > > > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~. > > -- > Peter Dalgaard, Professor, > Center for Statistics, Copenhagen Business School > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > Phone: (+45)38153501 > Office: A 4.23 > Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com > > ______________________________________________ > R-devel at r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel >-- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Mathematical Modelling, Statistics and Bio-Informatics tel : +32 (0)9 264 61 79 Joris.Meys at Ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php [[alternative HTML version deleted]]