diff --git a/tests/components/bmw_connected_drive/test_diagnostics.py b/tests/components/bmw_connected_drive/test_diagnostics.py
index 5b22fdcf71d..2f58bc0e4a0 100644
--- a/tests/components/bmw_connected_drive/test_diagnostics.py
+++ b/tests/components/bmw_connected_drive/test_diagnostics.py
@@ -1,8 +1,6 @@
 """Test BMW diagnostics."""
 
 import datetime
-import os
-import time
 
 import pytest
 from syrupy.assertion import SnapshotAssertion
@@ -20,7 +18,7 @@ from tests.components.diagnostics import (
 from tests.typing import ClientSessionGenerator
 
 
-@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11))
+@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11, tzinfo=datetime.UTC))
 async def test_config_entry_diagnostics(
     hass: HomeAssistant,
     hass_client: ClientSessionGenerator,
@@ -29,10 +27,6 @@ async def test_config_entry_diagnostics(
 ) -> None:
     """Test config entry diagnostics."""
 
-    # Make sure that local timezone for test is UTC
-    os.environ["TZ"] = "UTC"
-    time.tzset()
-
     mock_config_entry = await setup_mocked_integration(hass)
 
     diagnostics = await get_diagnostics_for_config_entry(
@@ -42,7 +36,7 @@ async def test_config_entry_diagnostics(
     assert diagnostics == snapshot
 
 
-@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11))
+@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11, tzinfo=datetime.UTC))
 async def test_device_diagnostics(
     hass: HomeAssistant,
     hass_client: ClientSessionGenerator,
@@ -52,10 +46,6 @@ async def test_device_diagnostics(
 ) -> None:
     """Test device diagnostics."""
 
-    # Make sure that local timezone for test is UTC
-    os.environ["TZ"] = "UTC"
-    time.tzset()
-
     mock_config_entry = await setup_mocked_integration(hass)
 
     reg_device = device_registry.async_get_device(
@@ -70,7 +60,7 @@ async def test_device_diagnostics(
     assert diagnostics == snapshot
 
 
-@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11))
+@pytest.mark.freeze_time(datetime.datetime(2022, 7, 10, 11, tzinfo=datetime.UTC))
 async def test_device_diagnostics_vehicle_not_found(
     hass: HomeAssistant,
     hass_client: ClientSessionGenerator,
@@ -80,10 +70,6 @@ async def test_device_diagnostics_vehicle_not_found(
 ) -> None:
     """Test device diagnostics when the vehicle cannot be found."""
 
-    # Make sure that local timezone for test is UTC
-    os.environ["TZ"] = "UTC"
-    time.tzset()
-
     mock_config_entry = await setup_mocked_integration(hass)
 
     reg_device = device_registry.async_get_device(