Date Time, as.POSIXct used locale, strange plot behavior

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Date Time, as.POSIXct used locale, strange plot behavior

Tilmann Faul
Hy,

stumbled over the following problem while plotting DateTime Objects.

plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
1), type='l')

arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
       0.3,
       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
       0.2,
       length=0.07, angle=15)

# arrow at 02:00, why?

arrows(as.POSIXct("2021-04-21 00:00:00"),
       0.3,
       as.POSIXct("2021-04-21 00:00:00"),
       0.2,
       length=0.07, angle=15, col='red')

# arrow at 00:00 as expected

as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1]
# [1] "2021-04-21 CEST"
as.POSIXct("2021-04-21 00:00:00", tz="CEST")
# [1] "2021-04-21 CEST"
as.POSIXct("2021-04-21 00:00:00")
# [1] "2021-04-21 CEST"

all representations on my system are the same, why is the plot location
of the arrows different??
I am located in Germany, my locale:
Sys.getlocale()
[1]
"LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C"

Any Idea?

Best regards
Tilmann

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Re: Date Time, as.POSIXct used locale, strange plot behavior

Jeff Newmiller
What is your TZ environment variable set to? That's what time conversion defaults to  ?DateTimeClasses

Also, I am not sure CEST is a valid timezone designation... it can be system dependent, but using one of the elements listed in ?OlsonNames.

On April 29, 2021 12:22:44 PM PDT, Tilmann Faul <[hidden email]> wrote:

>Hy,
>
>stumbled over the following problem while plotting DateTime Objects.
>
>plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
>1), type='l')
>
>arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>       0.3,
>       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>       0.2,
>       length=0.07, angle=15)
>
># arrow at 02:00, why?
>
>arrows(as.POSIXct("2021-04-21 00:00:00"),
>       0.3,
>       as.POSIXct("2021-04-21 00:00:00"),
>       0.2,
>       length=0.07, angle=15, col='red')
>
># arrow at 00:00 as expected
>
>as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1]
># [1] "2021-04-21 CEST"
>as.POSIXct("2021-04-21 00:00:00", tz="CEST")
># [1] "2021-04-21 CEST"
>as.POSIXct("2021-04-21 00:00:00")
># [1] "2021-04-21 CEST"
>
>all representations on my system are the same, why is the plot location
>of the arrows different??
>I am located in Germany, my locale:
>Sys.getlocale()
>[1]
>"LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C"
>
>Any Idea?
>
>Best regards
>Tilmann
>
>______________________________________________
>[hidden email] 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.

--
Sent from my phone. Please excuse my brevity.

______________________________________________
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Re: Date Time, as.POSIXct used locale, strange plot behavior

PIKAL Petr
Hi.

It should be probably CET not CEST.

arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
       0.3,
       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
       0.2,
       length=0.07, angle=15)


arrows(as.POSIXct("2021-04-21 00:00:00", tz="CET"),
       0.3,
       as.POSIXct("2021-04-21 00:00:00", tz="CET"),
       0.2,
       length=0.07, angle=15)

Cheers
Petr

> -----Original Message-----
> From: R-help <[hidden email]> On Behalf Of Jeff Newmiller
> Sent: Thursday, April 29, 2021 11:20 PM
> To: [hidden email]; Tilmann Faul <[hidden email]>
> Subject: Re: [R] Date Time, as.POSIXct used locale, strange plot behavior
>
> What is your TZ environment variable set to? That's what time conversion
> defaults to  ?DateTimeClasses
>
> Also, I am not sure CEST is a valid timezone designation... it can be
system

> dependent, but using one of the elements listed in ?OlsonNames.
>
> On April 29, 2021 12:22:44 PM PDT, Tilmann Faul <[hidden email]>
> wrote:
> >Hy,
> >
> >stumbled over the following problem while plotting DateTime Objects.
> >
> >plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
> >1), type='l')
> >
> >arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
> >       0.3,
> >       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
> >       0.2,
> >       length=0.07, angle=15)
> >
> ># arrow at 02:00, why?
> >
> >arrows(as.POSIXct("2021-04-21 00:00:00"),
> >       0.3,
> >       as.POSIXct("2021-04-21 00:00:00"),
> >       0.2,
> >       length=0.07, angle=15, col='red')
> >
> ># arrow at 00:00 as expected
> >
> >as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1] # [1]
> >"2021-04-21 CEST"
> >as.POSIXct("2021-04-21 00:00:00", tz="CEST") # [1] "2021-04-21 CEST"
> >as.POSIXct("2021-04-21 00:00:00")
> ># [1] "2021-04-21 CEST"
> >
> >all representations on my system are the same, why is the plot location
> >of the arrows different??
> >I am located in Germany, my locale:
> >Sys.getlocale()
> >[1]
> >"LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-
> 8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-
> 8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-
> 8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_D
> E.UTF-8;LC_IDENTIFICATION=C"
> >
> >Any Idea?
> >
> >Best regards
> >Tilmann
> >
> >______________________________________________
> >[hidden email] 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.
>
> --
> Sent from my phone. Please excuse my brevity.
>
> ______________________________________________
> [hidden email] 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.

______________________________________________
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Re: Date Time, as.POSIXct used locale, strange plot behavior

Tilmann Faul
In reply to this post by Jeff Newmiller
Dear Jeff,

Thanks for your answer.
Sys.timezone()  gives
[1] "Europe/Berlin"
I tried "Europe/Berlin" as tz argument, giving the same result als using
"CEST" (Central European Summer Time).
It seems to me, that using as.POSIXct without tz argument defaults to tz
UTC and with tz argument, either "CEST" or "Europ/Berlin" uses the
European tz, regarding the plot.
Never the less i do not understand why all of them have the same time
printout on my system.

as.POSIXct("2021-04-21 00:00:00", tz="CEST")
# [1] "2021-04-21 CEST"
as.POSIXct("2021-04-21 00:00:00", tz="Europ/Berlin")
# [1] "2021-04-21 Europ"
as.POSIXct("2021-04-21 00:00:00")
# [1] "2021-04-21 CEST"

Can someone comment on that, please?

best Regards
Tilmann

On 29.04.21 23:19, Jeff Newmiller wrote:

> What is your TZ environment variable set to? That's what time conversion defaults to  ?DateTimeClasses
>
> Also, I am not sure CEST is a valid timezone designation... it can be system dependent, but using one of the elements listed in ?OlsonNames.
>
> On April 29, 2021 12:22:44 PM PDT, Tilmann Faul <[hidden email]> wrote:
>> Hy,
>>
>> stumbled over the following problem while plotting DateTime Objects.
>>
>> plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
>> 1), type='l')
>>
>> arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>       0.3,
>>       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>       0.2,
>>       length=0.07, angle=15)
>>
>> # arrow at 02:00, why?
>>
>> arrows(as.POSIXct("2021-04-21 00:00:00"),
>>       0.3,
>>       as.POSIXct("2021-04-21 00:00:00"),
>>       0.2,
>>       length=0.07, angle=15, col='red')
>>
>> # arrow at 00:00 as expected
>>
>> as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1]
>> # [1] "2021-04-21 CEST"
>> as.POSIXct("2021-04-21 00:00:00", tz="CEST")
>> # [1] "2021-04-21 CEST"
>> as.POSIXct("2021-04-21 00:00:00")
>> # [1] "2021-04-21 CEST"
>>
>> all representations on my system are the same, why is the plot location
>> of the arrows different??
>> I am located in Germany, my locale:
>> Sys.getlocale()
>> [1]
>> "LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C"
>>
>> Any Idea?
>>
>> Best regards
>> Tilmann
>>
>> ______________________________________________
>> [hidden email] 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.
>

______________________________________________
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Re: Date Time, as.POSIXct used locale, strange plot behavior

Enrico Schumann-2
On Fri, 30 Apr 2021, Tilmann Faul writes:

> Dear Jeff,
>
> Thanks for your answer.
> Sys.timezone()  gives
> [1] "Europe/Berlin"
> I tried "Europe/Berlin" as tz argument, giving the same result als using
> "CEST" (Central European Summer Time).
> It seems to me, that using as.POSIXct without tz argument defaults to tz
> UTC and with tz argument, either "CEST" or "Europ/Berlin" uses the
> European tz, regarding the plot.
> Never the less i do not understand why all of them have the same time
> printout on my system.
>
> as.POSIXct("2021-04-21 00:00:00", tz="CEST")
> # [1] "2021-04-21 CEST"
> as.POSIXct("2021-04-21 00:00:00", tz="Europ/Berlin")
> # [1] "2021-04-21 Europ"
> as.POSIXct("2021-04-21 00:00:00")
> # [1] "2021-04-21 CEST"
>
> Can someone comment on that, please?
>
> best Regards
> Tilmann

Timezone names in general are not portable (i.e. not
safe to use).  You may always specify a timezone name,
but it may be ignored:

    as.POSIXct("2021-04-21 00:00:00", tz = "PartyTime")
    ## "2021-04-21 PartyTime"

So just because your system prints "CEST", it does not
mean it has recognised it as a timezone. (To make it
even more complicated: your system may display a time
as "CEST", meaning a time in Central European Summer
Time, but still not accept "CEST" as _input_ for a
timezone name.)

'POSIXct' represents time as a number (seconds since
1970). To compare the results of different calls, it is
easier to compare those numbers.

    dput(as.POSIXct("2021-04-21 00:00:00", tz="CEST"))
    ## structure(1618963200, class = c("POSIXct", "POSIXt"), tzone = "CEST")
    dput(as.POSIXct("2021-04-21 00:00:00", tz="PartyTime"))
    ## structure(1618963200, class = c("POSIXct", "POSIXt"), tzone = "PartyTime")

    dput(as.POSIXct("2021-04-21 00:00:00", tz="Europe/Berlin"))
    ## structure(1618956000, class = c("POSIXct", "POSIXt"), tzone = "Europe/Berlin")
    dput(as.POSIXct("2021-04-21 00:00:00"))
    ## structure(1618956000, class = c("POSIXct", "POSIXt"), tzone = "")

So in your case, "CEST" is (most likely) not recognised
as a valid input for a timezone name, and hence it is
ignored, but still displayed.

HTH
    Enrico


> On 29.04.21 23:19, Jeff Newmiller wrote:
>> What is your TZ environment variable set to? That's what time conversion defaults to  ?DateTimeClasses
>>
>> Also, I am not sure CEST is a valid timezone designation... it can be system dependent, but using one of the elements listed in ?OlsonNames.
>>
>> On April 29, 2021 12:22:44 PM PDT, Tilmann Faul <[hidden email]> wrote:
>>> Hy,
>>>
>>> stumbled over the following problem while plotting DateTime Objects.
>>>
>>> plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
>>> 1), type='l')
>>>
>>> arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>>       0.3,
>>>       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>>       0.2,
>>>       length=0.07, angle=15)
>>>
>>> # arrow at 02:00, why?
>>>
>>> arrows(as.POSIXct("2021-04-21 00:00:00"),
>>>       0.3,
>>>       as.POSIXct("2021-04-21 00:00:00"),
>>>       0.2,
>>>       length=0.07, angle=15, col='red')
>>>
>>> # arrow at 00:00 as expected
>>>
>>> as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1]
>>> # [1] "2021-04-21 CEST"
>>> as.POSIXct("2021-04-21 00:00:00", tz="CEST")
>>> # [1] "2021-04-21 CEST"
>>> as.POSIXct("2021-04-21 00:00:00")
>>> # [1] "2021-04-21 CEST"
>>>
>>> all representations on my system are the same, why is the plot location
>>> of the arrows different??
>>> I am located in Germany, my locale:
>>> Sys.getlocale()
>>> [1]
>>> "LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C"
>>>
>>> Any Idea?
>>>
>>> Best regards
>>> Tilmann
>>>
>>> ______________________________________________
>>> [hidden email] 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.
>>
>
> ______________________________________________
> [hidden email] 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.

--
Enrico Schumann
Lucerne, Switzerland
http://enricoschumann.net

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Re: Date Time, as.POSIXct used locale, strange plot behavior

Tilmann Faul
Dear Enrico,

Thanks a lot, that clarifies the topic for me.
Checking the numeric representation i was not aware of.

Best Regards
Tilmann

On 30.04.21 11:17, Enrico Schumann wrote:

> On Fri, 30 Apr 2021, Tilmann Faul writes:
>
>> Dear Jeff,
>>
>> Thanks for your answer.
>> Sys.timezone()  gives
>> [1] "Europe/Berlin"
>> I tried "Europe/Berlin" as tz argument, giving the same result als using
>> "CEST" (Central European Summer Time).
>> It seems to me, that using as.POSIXct without tz argument defaults to tz
>> UTC and with tz argument, either "CEST" or "Europ/Berlin" uses the
>> European tz, regarding the plot.
>> Never the less i do not understand why all of them have the same time
>> printout on my system.
>>
>> as.POSIXct("2021-04-21 00:00:00", tz="CEST")
>> # [1] "2021-04-21 CEST"
>> as.POSIXct("2021-04-21 00:00:00", tz="Europ/Berlin")
>> # [1] "2021-04-21 Europ"
>> as.POSIXct("2021-04-21 00:00:00")
>> # [1] "2021-04-21 CEST"
>>
>> Can someone comment on that, please?
>>
>> best Regards
>> Tilmann
>
> Timezone names in general are not portable (i.e. not
> safe to use).  You may always specify a timezone name,
> but it may be ignored:
>
>     as.POSIXct("2021-04-21 00:00:00", tz = "PartyTime")
>     ## "2021-04-21 PartyTime"
>
> So just because your system prints "CEST", it does not
> mean it has recognised it as a timezone. (To make it
> even more complicated: your system may display a time
> as "CEST", meaning a time in Central European Summer
> Time, but still not accept "CEST" as _input_ for a
> timezone name.)
>
> 'POSIXct' represents time as a number (seconds since
> 1970). To compare the results of different calls, it is
> easier to compare those numbers.
>
>     dput(as.POSIXct("2021-04-21 00:00:00", tz="CEST"))
>     ## structure(1618963200, class = c("POSIXct", "POSIXt"), tzone = "CEST")
>     dput(as.POSIXct("2021-04-21 00:00:00", tz="PartyTime"))
>     ## structure(1618963200, class = c("POSIXct", "POSIXt"), tzone = "PartyTime")
>
>     dput(as.POSIXct("2021-04-21 00:00:00", tz="Europe/Berlin"))
>     ## structure(1618956000, class = c("POSIXct", "POSIXt"), tzone = "Europe/Berlin")
>     dput(as.POSIXct("2021-04-21 00:00:00"))
>     ## structure(1618956000, class = c("POSIXct", "POSIXt"), tzone = "")
>
> So in your case, "CEST" is (most likely) not recognised
> as a valid input for a timezone name, and hence it is
> ignored, but still displayed.
>
> HTH
>     Enrico
>
>
>> On 29.04.21 23:19, Jeff Newmiller wrote:
>>> What is your TZ environment variable set to? That's what time conversion defaults to  ?DateTimeClasses
>>>
>>> Also, I am not sure CEST is a valid timezone designation... it can be system dependent, but using one of the elements listed in ?OlsonNames.
>>>
>>> On April 29, 2021 12:22:44 PM PDT, Tilmann Faul <[hidden email]> wrote:
>>>> Hy,
>>>>
>>>> stumbled over the following problem while plotting DateTime Objects.
>>>>
>>>> plot(as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59")), c(0,
>>>> 1), type='l')
>>>>
>>>> arrows(as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>>>       0.3,
>>>>       as.POSIXct("2021-04-21 00:00:00", tz="CEST"),
>>>>       0.2,
>>>>       length=0.07, angle=15)
>>>>
>>>> # arrow at 02:00, why?
>>>>
>>>> arrows(as.POSIXct("2021-04-21 00:00:00"),
>>>>       0.3,
>>>>       as.POSIXct("2021-04-21 00:00:00"),
>>>>       0.2,
>>>>       length=0.07, angle=15, col='red')
>>>>
>>>> # arrow at 00:00 as expected
>>>>
>>>> as.POSIXct(c("2021-04-21 00:00:00", "2021-04-21 23:59:59"))[1]
>>>> # [1] "2021-04-21 CEST"
>>>> as.POSIXct("2021-04-21 00:00:00", tz="CEST")
>>>> # [1] "2021-04-21 CEST"
>>>> as.POSIXct("2021-04-21 00:00:00")
>>>> # [1] "2021-04-21 CEST"
>>>>
>>>> all representations on my system are the same, why is the plot location
>>>> of the arrows different??
>>>> I am located in Germany, my locale:
>>>> Sys.getlocale()
>>>> [1]
>>>> "LC_CTYPE=de_DE.UTF-8;LC_NUMERIC=C;LC_TIME=de_DE.UTF-8;LC_COLLATE=de_DE.UTF-8;LC_MONETARY=de_DE.UTF-8;LC_MESSAGES=de_DE.UTF-8;LC_PAPER=de_DE.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=de_DE.UTF-8;LC_IDENTIFICATION=C"
>>>>
>>>> Any Idea?
>>>>
>>>> Best regards
>>>> Tilmann
>>>>
>>>> ______________________________________________
>>>> [hidden email] 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.
>>>
>>
>> ______________________________________________
>> [hidden email] 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.
>

______________________________________________
[hidden email] 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.