Remove windows tz workarounds

Author: rok

.github/workflows/cpp.yml

@@ -348,6 +348,9 @@ jobs:
         with:
           fetch-depth: 0
           submodules: recursive
+      - name: Download Timezone Database
+        shell: bash
+        run: ci/scripts/download_tz_database.sh
       - uses: msys2/setup-msys2@v2
         with:
           msystem: ${{ matrix.msystem_upper }}
@@ -366,9 +369,6 @@ jobs:
         run: |
           export CMAKE_BUILD_PARALLEL_LEVEL=$NUMBER_OF_PROCESSORS
           ci/scripts/cpp_build.sh "$(pwd)" "$(pwd)/build"
-      - name: Download Timezone Database
-        shell: bash
-        run: ci/scripts/download_tz_database.sh
       - name: Download MinIO
         shell: msys2 {0}
         run: |

.github/workflows/cpp_extra.yml

@@ -365,9 +365,6 @@ jobs:
         with:
           fetch-depth: 0
           submodules: recursive
-      - name: Download Timezone Database
-        shell: bash
-        run: ci/scripts/download_tz_database.sh
       - name: Install cmake
         shell: bash
         run: |

.github/workflows/cpp_windows.yml

@@ -81,9 +81,6 @@ jobs:
         with:
           fetch-depth: 0
           submodules: recursive
-      - name: Download Timezone Database
-        shell: bash
-        run: ci/scripts/download_tz_database.sh
       - name: Install msys2 (for tzdata for ORC tests)
         uses: msys2/setup-msys2@v2
         id: setup-msys2

.github/workflows/matlab.yml

@@ -147,9 +147,6 @@ jobs:
         uses: matlab-actions/setup-matlab@v2
         with:
           release: R2025b
-      - name: Download Timezone Database
-        shell: bash
-        run: ci/scripts/download_tz_database.sh
       - name: Install ccache
         shell: bash
         run: ci/scripts/install_ccache.sh 4.6.3 /usr

.github/workflows/verify_rc.yml

@@ -228,9 +228,6 @@ jobs:
         run: |
           choco install --no-progress --yes boost-msvc-14.1
           choco install --no-progress --yes wget
-      - name: Download Timezone Database
-        shell: bash
-        run: ci/scripts/download_tz_database.sh
       - name: Run verification
         env:
           GH_TOKEN: ${{ github.token }}

c_glib/test/test-assume-timezone-options.rb

@@ -45,7 +45,6 @@ def test_nonexistent_property
   end
 
   def test_assume_timezone_function
-    omit("Missing tzdata on Windows") if Gem.win_platform?
     args = [
       Arrow::ArrayDatum.new(build_timestamp_array(:milli, [1504953190000])),
     ]

c_glib/test/test-day-of-week-options.rb

@@ -39,7 +39,6 @@ def test_week_start_property
   end
 
   def test_day_of_week_function_with_count_from_zero_false
-    omit("Missing tzdata on Windows") if Gem.win_platform?
     args = [
       # 2017-09-09T10:33:10Z (Saturday)
       Arrow::ArrayDatum.new(build_timestamp_array(:milli, [1504953190000])),
@@ -51,7 +50,6 @@ def test_day_of_week_function_with_count_from_zero_false
   end
 
   def test_day_of_week_function_with_week_start
-    omit("Missing tzdata on Windows") if Gem.win_platform?
     args = [
       # 2017-09-09T10:33:10Z (Saturday)
       Arrow::ArrayDatum.new(build_timestamp_array(:milli, [1504953190000])),

c_glib/test/test-strftime-options.rb

@@ -35,7 +35,6 @@ def test_locale_property
   end
 
   def test_strftime_function
-    omit("Missing tzdata on Windows") if Gem.win_platform?
     args = [
       Arrow::ArrayDatum.new(build_timestamp_array(:milli, [1504953190854])),
     ]

ci/scripts/download_tz_database.sh

@@ -17,6 +17,9 @@
 # specific language governing permissions and limitations
 # under the License.
 
+# Downloads IANA timezone database for use with the vendored date library
+# on Windows when not using MSVC (e.g., MinGW builds).
+
 set -ex
 
 # Download database

cpp/src/arrow/compute/function_test.cc

@@ -95,11 +95,9 @@ TEST(FunctionOptions, Equality) {
   options.emplace_back(new StrptimeOptions("%Y", TimeUnit::type::MILLI, true));
   options.emplace_back(new StrptimeOptions("%Y", TimeUnit::type::NANO));
   options.emplace_back(new StrftimeOptions("%Y-%m-%dT%H:%M:%SZ", "C"));
-#ifndef _WIN32
   options.emplace_back(new AssumeTimezoneOptions(
       "Europe/Amsterdam", AssumeTimezoneOptions::Ambiguous::AMBIGUOUS_RAISE,
       AssumeTimezoneOptions::Nonexistent::NONEXISTENT_RAISE));
-#endif
   options.emplace_back(new PadOptions(5, " "));
   options.emplace_back(new PadOptions(10, "A"));
   options.emplace_back(new PadOptions(10, "A", false));