[Rd] timezone tests and R-devel

[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')"

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