>>>>> Kasper Daniel Hansen
>>>>> on Thu, 1 Oct 2020 20:31:12 +0200 writes:
> 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')"
Yes, this is a new feature, actually a __bug fix__ in R-devel,
see NEWS :
• all.equal.POSIXt() no longer warns about and subsequently ignores
inconsistent "tzone" attributes, but describes the difference in
its return value (PR#17277). This check can be disabled _via_
the new argument check.tzone = FALSE; as suggested by Sebastian
Meyer.
Here's pure R code for reproducing what you've seen :
x <- structure(1601623657, class = c("POSIXct", "POSIXt"))
Sys.unsetenv("TZ")
all.equal(x, ltx <- as.POSIXlt(x)) # TRUE
attr(ltx, "tzone") # [1] "" "CET" "CEST"
Sys.setenv(TZ = "US/Eastern")
all.equal(x, ltx <- as.POSIXlt(x))
## "'tzone' attributes are inconsistent ('' and 'US/Eastern')"
all.equal(x, ltx, check.tzone = FALSE) # TRUE
Sys.unsetenv("TZ")
all.equal(x, ltx <- as.POSIXlt(x)) # TRUE
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