jonkeane commented on a change in pull request #12240:
URL: https://github.com/apache/arrow/pull/12240#discussion_r791756282
##########
File path: r/tests/testthat/test-Array.R
##########
@@ -985,3 +985,14 @@ test_that("Array to C-interface", {
delete_arrow_schema(schema_ptr)
delete_arrow_array(array_ptr)
})
+
+test_that("Array coverts timestamps with missing timezone /assumed local tz
correctly", {
+ withr::with_envvar(c(TZ = "America/Chicago"), {
+ a <- as.POSIXct("1970-01-01 00:00:00")
+ attr(a, "tzone") <- Sys.getenv("TZ")
Review comment:
> But wouldn't those arrays be equal in their absolute value (without
the "tzone" medatadata)
This is what we expect + want, no? R creates a POSIXct by taking the
datetime string you have and converting it to the number of seconds from the
epoch based on the time string being in the local timezone of the session
(unless you proactively provide a different one). This is what I mean when I
say that for R the timezoneless timestamps are *not* naive, they are really
timestamps at a specific timezone, R just happens to spell that timezone
confusingly as `""` sometimes.
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