Hi,
that is what I tried to show to Stefano. That the issue was only with printing
the values on console or as you explained in more depth the default formating
when all time values (HMS) are zero.
So that Stefano used correct syntax.
Cheers
Petr
> -----Original Message-----
> From: Duncan Murdoch <murdoch.duncan at gmail.com>
> Sent: Tuesday, November 30, 2021 12:05 PM
> To: Jim Lemon <drjimlemon at gmail.com>; PIKAL Petr
> <petr.pikal at precheza.cz>
> Cc: r-help mailing list <r-help at r-project.org>; Stefano Sofia
> <stefano.sofia at regione.marche.it>
> Subject: Re: [R] converting to POSIXct
>
> On 30/11/2021 3:41 a.m., Jim Lemon wrote:
> > Hi,
> > Petr is right. Apparently as.POSIXct drops the smallest increments if
> > all are zero:
>
> That's not as.POSIXct doing anything: there's no way to drop
increments, the
> POSIXct format records a number of seconds and that can't be changed.
>
> What is happening is simply the default formatting.
>
> Be explicit about the format if you want to see the seconds, e.g.
>
> > format(ssdf$data_POSIX, format = '%Y-%m-%d %H:%M:%S') [1]
"2002-11-
> 01 00:00:00" "2002-11-01 00:00:00"
>
> Duncan Murdoch
>
> >
> > ssdf<-read.csv(text="data_POSIX,Sensor_code,value
> > 2002-11-01 00:00:01,1694,7.2
> > 2002-11-01 00:00:00,1723,10.8",
> > stringsAsFactors=FALSE)
> > ssdf$data_POSIX<-as.POSIXct(ssdf$data_POSIX,"%Y-%m-%d
HH:MM:SS")
> ssdf
> >
> > data_POSIX Sensor_code value
> > 1 2002-11-01 00:00:01 1694 7.2
> > 2 2002-11-01 00:00:00 1723 10.8
> >
> > but if there is a single small increment, they all show up.
> >
> > Jim
> >
> > On Tue, Nov 30, 2021 at 7:33 PM PIKAL Petr <petr.pikal at
precheza.cz>
> wrote:
> >>
> >> Hi
> >>
> >> You probably has zero hours in all your data
> >>
> >> see
> >>> temp
> >> data_POSIX Sensor_code value
> >> 1 2002-11-01 00:00:00 1694 7.2
> >> 2 2002-11-01 00:00:00 1723 10.8
> >>
> >> without hours
> >>> as.POSIXct(temp$data_POSIX, format = "%Y-%m-%d
%H:%M:%S",
> >>> tz="Etc/GMT-1")
> >> [1] "2002-11-01 +01" "2002-11-01 +01"
> >>
> >> add value to hours
> >>> fix(temp)
> >>> temp
> >> data_POSIX Sensor_code value
> >> 1 2002-11-01 00:01:00 1694 7.2
> >> 2 2002-11-01 00:00:00 1723 10.8
> >>
> >> Voila, hours are back.
> >>> as.POSIXct(temp$data_POSIX, format = "%Y-%m-%d
%H:%M:%S",
> >>> tz="Etc/GMT-1")
> >> [1] "2002-11-01 00:01:00 +01" "2002-11-01 00:00:00
+01"
> >>
> >> So nothing wrong in uyour code, hours are there but they are
probably
> not printed to console and hours are there but hidden.
> >>
> >> Cheers
> >> Petr
> >>
> >>> -----Original Message-----
> >>> From: R-help <r-help-bounces at r-project.org> On Behalf
Of Stefano
> >>> Sofia
> >>> Sent: Tuesday, November 30, 2021 9:20 AM
> >>> To: r-help mailing list <r-help at r-project.org>
> >>> Subject: [R] converting to POSIXct
> >>>
> >>> Dear R-list users,
> >>> I thought I was able to manage easily POSIXct, but this is not
true.
> >>> I am not going to load the input txt file because I know that
> >>> attachments are not allowed. The structure of my input txt
file is
> >>>
> >>> data_POSIX,Sensor_code,value
> >>> 2002-11-01 00:00:00,1694,7.2
> >>> 2002-11-01 00:00:00,1723,10.8
> >>> ...
> >>>
> >>> I load it with
> >>> myfile <- read.table(file="mypath/myfile.txt",
header = TRUE,
> >>> sep=",", dec = ".", stringsAsFactors =
FALSE)
> >>>
> >>> When I try to convert the data_POSIX column (which is a
character)
> >>> to POSIXct with
> >>>
> >>> myfile$data_POSIX <- as.POSIXct(myfile$data_POSIX, format
> >>> "%Y-%m-%d %H:%M:%S", tz="Etc/GMT-1")
> >>>
> >>> the outupt is
> >>>
> >>> 2002-11-01 1694 7.2
> >>> 2002-11-01 1723 10.8
> >>> ...
> >>>
> >>> Why I keep loosing hours, minutes and seconds? Wher eis my
mistake
> >>> or my misunderstanding?
> >>>
> >>> Sorry again if I have not been able to reproduce the R code,
and
> >>> thank you for your support.
> >>> Stefano
> >>>
> >>> (oo)
> >>> --oOO--( )--OOo--------------------------------------
> >>> Stefano Sofia PhD
> >>> Civil Protection - Marche Region - Italy Meteo Section Snow
Section
> >>> Via del Colle Ameno 5
> >>> 60126 Torrette di Ancona, Ancona (AN)
> >>> Uff: +39 071 806 7743
> >>> E-mail: stefano.sofia at regione.marche.it
> >>> ---Oo---------oO----------------------------------------
> >>>
> >>> ________________________________
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> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >