rok commented on a change in pull request #11105:
URL: https://github.com/apache/arrow/pull/11105#discussion_r713192365
##########
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:
Ok, I think I finally understand what the issue is here. Arrow's
`strftime` behaves differently than R's.
Arrow `strftime(x, format = "%c %Z")`:
`Sat 01 Jan 2022 00:00:00 AM CET EST`
R `strftime(x, format = "%c")`:
`Sat 01 Jan 2022 12:00:00 AM EST EST`
It's probably a bug in the C++ library we use so I opened an issue and added
a reference to it in the comment
https://github.com/HowardHinnant/date/issues/704
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