jonkeane commented on a change in pull request #12240:
URL: https://github.com/apache/arrow/pull/12240#discussion_r791021403



##########
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:
       This is a good first step, but would it be better to have two timestamps 
here? One that was created with `TZ` unset, and then one where we specifically 
set the timezone with `attr(b, "tzone"), Sys.timezone())` And confirm that 
those two arrays are equal?




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