thisisnic commented on a change in pull request #11105:
URL: https://github.com/apache/arrow/pull/11105#discussion_r712118233



##########
File path: r/tests/testthat/test-dplyr-string-functions.R
##########
@@ -719,6 +719,69 @@ test_that("errors in strptime", {
   )
 })
 
+test_that("strftime", {
+  skip_on_os("windows") # https://issues.apache.org/jira/browse/ARROW-13168
+
+  # TODO: consider reevaluating this workaround after ARROW-12980
+  withr::local_timezone("UTC")
+  times <- tibble(x = c(lubridate::ymd_hms("2018-10-07 19:04:05"), NA))
+  seconds <- tibble(x = c("05.000000", NA))
+  formats_minus_c <- "%a %A %w %d %b %B %m %y %Y %H %I %p %M %z %Z %j %U %W %x 
%X %% %G %V %u"
+  formats <- paste(formats_minus_c, "%c")
+
+  expect_dplyr_equal(
+    input %>%
+      mutate(x = strftime(x, format = formats)) %>%
+      collect(),
+    times
+  )
+
+  withr::with_timezone("Pacific/Marquesas",
+   expect_dplyr_equal(
+      input %>%
+        mutate(x = strftime(x, format = formats)) %>%
+        collect(),
+      times
+    )
+  )
+
+  expect_dplyr_equal(
+    input %>%
+      mutate(x = strftime(x, format = formats_minus_c, tz = 
"Pacific/Marquesas")) %>%
+      collect(),
+    times
+  )
+
+  withr::with_locale(new = c("LC_TIME" = "C"),
+    expect_dplyr_equal(
+      input %>%
+        mutate(x = strftime(x, format = "%c", tz = "Pacific/Marquesas")) %>%
+        collect(),
+      times
+    )
+  )

Review comment:
       I'm a bit confused here - can you elaborate a bit more on your comments 
above please?




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