TST: Add timezone test

unittests/test_cfood.py

@@ -236,6 +236,11 @@ class InsertionTest(unittest.TestCase):
             entity_xml.format("2020-01-01T00:00:00.000")))
         assure_has_property(entity=rec, name="TestDate", value=datetime(
             2020, 1, 1), to_be_updated=to_be_updated)
+        rec = _parse_single_xml_element(etree.fromstring(
+            entity_xml.format("2020-01-01T00:00:00.000+0100")))
+        assure_has_property(entity=rec, name="TestDate", value=datetime(
+            2020, 1, 1), to_be_updated=to_be_updated)
+        
         assert len(to_be_updated) == 1