[Rd] timezone tests and R-devel

[Kasper Daniel Hansen]

Yes, the potential issue I see is that
  make check
fails when I explicitly set TZ. However, I set it to be the same as what
the system reports when I login.

Details: The system (RHEL) I am working on has
$ strings /etc/localtime | tail -n 1
EST5EDT,M3.2.0,M11.1.0
$ date +%Z
EDT
$ echo $TZ
US/Eastern



On Fri, Oct 2, 2020 at 9:48 AM Sebastian Meyer <seb.meyer using fau.de> wrote:

> Thank you for the report. In R-devel, all.equal.POSIXt() by default
> reports inconsistent time zones. Previously,
>
> > x <- Sys.time()
> > all.equal(x, as.POSIXlt(x, tz = "EST5EDT"))
>
> would return TRUE. To ignore the time zone attributes in R-devel, the
> argument 'check.tzone = FALSE' needs to be used.
>
> That said, I can reproduce the 'make check' failure in R-devel on Ubuntu
> Linux when TZ is set, even if it is set to the system time zone:
>
> $ export TZ=Europe/Berlin
> $ make check
> [...]
> > running code in '../../tests/reg-tests-2.R' ... OK
> >   comparing 'reg-tests-2.Rout' to '../../tests/reg-tests-2.Rout.save'
> ...7335c7335
> > < [1] "'tzone' attributes are inconsistent ('' and 'Europe/Berlin')"
> > ---
> >> [1] TRUE
>
>
> Compare the following two sessions:
>
> > R-devel --vanilla --no-echo -e 'Sys.timezone(); x <- Sys.time();
> all.equal(x, as.POSIXlt(x))'
> [1] "Europe/Berlin"
> [1] TRUE
>
> > TZ='Europe/Berlin' R-devel --vanilla --no-echo -e 'Sys.timezone(); x <-
> Sys.time(); all.equal(x, as.POSIXlt(x))'
> [1] "Europe/Berlin"
> [1] "'tzone' attributes are inconsistent ('' and 'Europe/Berlin')"
>
>
> So as.POSIXlt() sets a 'tzone' attribute if TZ is set, but this
> behaviour is not new. Even with old R 3.6.3, I see
>
> > R-3.6.3 --vanilla --slave -e 'attr(as.POSIXlt(Sys.time()), "tzone")'
> [1] ""     "CET"  "CEST"
>
> > TZ='Europe/Berlin' R-3.6.3 --vanilla --slave -e
> 'attr(as.POSIXlt(Sys.time()), "tzone")'
> [1] "Europe/Berlin" "CET"           "CEST"
>
> This might be system-specific.
>
> I suggest to modify the test as attached for make check to pass in this
> setting.
>
> Best regards,
>
>         Sebastian
>
>
> Am 01.10.20 um 20:31 schrieb Kasper Daniel Hansen:
> > The return value of Sys.time() today with a timezone of US/Eastern is
> > unchanged between 4.0.3-patched and devel, but on devel the following
> test
> > fails
> >   all.equal(x, as.POSIXlt(x))
> > with
> >   x = Sys.time()
> >
> > This means that devel does not complete make tests (failure on
> > tests/reg-tests-2.R)
> >
> > It is entirely possible that it is an error on my end, I use
> >   export TZ="US/Eastern"
> > but I have been using this for a while, and R-4.0.3-patched built today
> > passes make tests.
> >
> > Details below, and I am happy to provide more information.
> >
> > Build platform: inside a conda environment on linux. I have been doing
> this
> > for a while, but it is certainly a non-standard setup. GCC 7.3
> >
> > Best,
> > Kasper
> >
> > On R version 4.0.3 beta (2020-10-01 r79286) I get
> >
> >> x = Sys.time()
> >> attributes(x)
> > $class
> > [1] "POSIXct" "POSIXt"
> >
> >> attributes(as.POSIXlt(x))
> > $names
> >  [1] "sec"    "min"    "hour"   "mday"   "mon"    "year"   "wday"
>  "yday"
> >  [9] "isdst"  "zone"   "gmtoff"
> >
> > $class
> > [1] "POSIXlt" "POSIXt"
> >
> > $tzone
> > [1] "US/Eastern" "EST"        "EDT"
> >
> >> all.equal(x, as.POSIXlt(x))
> > [1] TRUE
> >
> > On R Under development (unstable) (2020-10-01 r79286) I get
> >> x = Sys.time()
> >> all.equal(x,x)
> > [1] TRUE
> >> attributes(as.POSIXlt(x))
> > $names
> >  [1] "sec"    "min"    "hour"   "mday"   "mon"    "year"   "wday"
>  "yday"
> >  [9] "isdst"  "zone"   "gmtoff"
> >
> > $class
> > [1] "POSIXlt" "POSIXt"
> >
> > $tzone
> > [1] "US/Eastern" "EST"        "EDT"
> >
> >> all.equal(x, as.POSIXlt(x))
> > [1] "'tzone' attributes are inconsistent ('' and 'US/Eastern')"
> >
> >       [[alternative HTML version deleted]]
> >
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> >
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-- 
Best,
Kasper

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