From 9888be7f96ed41c4c6cd27ffe8f3e6abf01a61de Mon Sep 17 00:00:00 2001
From: Dmitri Plotnikov <dplotnikov@google.com>
Date: Wed, 6 May 2026 16:59:17 -0700
Subject: [PATCH] Skip timezone related conformance tests on Windows only

PiperOrigin-RevId: 911626528
---
 conformance/conformance_test.py | 7 +++++--
 custom_ext/BUILD                | 5 ++++-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/conformance/conformance_test.py b/conformance/conformance_test.py
index 9d25e64..7f55355 100644
--- a/conformance/conformance_test.py
+++ b/conformance/conformance_test.py
@@ -73,10 +73,13 @@ class ConformanceTestSuite(unittest.TestSuite):
       "optionals/optionals/optional_struct_optindex_index_value",
       "optionals/optionals/optional_struct_optindex_value",
       "optionals/optionals/struct_optindex_value",
-      # TODO(b/507568865): Timezone support on Windows.
-      "timestamps/timestamp_selectors_tz/.*",
   ]
 
+  if os.name == "nt":
+    # TODO(b/507568865): These tests depend on configuring a timezone database
+    # which isn't available in our windows test environment.
+    SKIP_TESTS.append("timestamps/timestamp_selectors_tz/.*")
+
   def __init__(self):
     super().__init__(self)
     self._load_tests()
diff --git a/custom_ext/BUILD b/custom_ext/BUILD
index 1718513..2329467 100644
--- a/custom_ext/BUILD
+++ b/custom_ext/BUILD
@@ -36,7 +36,10 @@ py_library(
     data = [
         "//cel_expr_python:cel",
     ],
-    deps = ["//cel_expr_python:cel"],
+    deps = select({
+        "@platforms//os:windows": [],
+        "//conditions:default": ["//cel_expr_python:cel"],
+    }),
 )
 
 py_test(