TST: Correct timezone in test, imporve millisecond test

unittests/test_cfood.py

@@ -34,7 +34,7 @@ from caosadvancedtools.crawler import FileCrawler
 from caosadvancedtools.example_cfood import ExampleCFood
 from caosdb.common.models import _parse_single_xml_element
 from lxml import etree
-from datetime import datetime
+from datetime import datetime, timezone
 
 PATTERN = "h.*"
 
@@ -233,13 +233,13 @@ class InsertionTest(unittest.TestCase):
             2020, 1, 1, 15, 0), to_be_updated=to_be_updated)
         assert len(to_be_updated) == 1
         rec = _parse_single_xml_element(etree.fromstring(
-            entity_xml.format("2020-01-01T00:00:00.000")))
+            entity_xml.format("2020-01-01T00:00:00.0")))
         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")))
+            entity_xml.format("2020-01-01T00:00:00.000+0000")))
         assure_has_property(entity=rec, name="TestDate", value=datetime(
-            2020, 1, 1), to_be_updated=to_be_updated)
+            2020, 1, 1, tzinfo=timezone.utc), to_be_updated=to_be_updated)
         
         assert len(to_be_updated) == 1