jorisvandenbossche commented on a change in pull request #12536:
URL: https://github.com/apache/arrow/pull/12536#discussion_r835074201



##########
File path: ci/appveyor-cpp-setup.bat
##########
@@ -115,3 +115,17 @@ powershell.exe -Command "Start-Process clcache-server" || 
exit /B
 if "%ARROW_S3%" == "ON" (
     appveyor DownloadFile 
https://dl.min.io/server/minio/release/windows-amd64/minio.exe -FileName 
C:\Windows\Minio.exe || exit /B
 )
+
+
+@rem
+@rem Download IANA Timezone Database for unit tests
+@rem
+@rem (Doc section: Download timezone database)
+curl https://data.iana.org/time-zones/releases/tzdata2021e.tar.gz --output 
tzdata.tar.gz

Review comment:
       The times in the past won't change, so unless we test against a random 
"now", updates to the timezone database (such as for DST policy changes) 
shouldn't impact those tests?




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