testing: Remove date from final_message test (SC-638)

tests/integration_tests/modules/test_combined.py

@@ -74,23 +74,16 @@ def test_final_message(self, class_client: IntegrationInstance):
         """Test that final_message module works as expected.
 
         Also tests LP 1511485: final_message is silent.
-
-        It's possible that if this test is run within a minute or so of
-        midnight that we'll see a failure because the day in the logs
-        is different from the day specified in the test definition.
         """
         client = class_client
         log = client.read_from_file('/var/log/cloud-init.log')
-        # Get date on host rather than locally as our host could be in a
-        # wildly different timezone (or more likely recording UTC)
-        today = client.execute('date "+%a, %d %b %Y"')
         expected = (
-            'This is my final message!\n'
-            r'\d+\.\d+.*\n'
-            '{}.*\n'
-            'DataSource.*\n'
-            r'\d+\.\d+'
-        ).format(today)
+            "This is my final message!\n"
+            r"\d+\.\d+.*\n"
+            r"\w{3}, \d{2} \w{3} \d{4} \d{2}:\d{2}:\d{2} \+\d{4}\n"  # Datetime
+            "DataSource.*\n"
+            r"\d+\.\d+"
+        )
 
         assert re.search(expected, log)