remove other occurences of datetime.now(), use utnow()

examples/server-example.py

@@ -92,7 +92,7 @@ if __name__ == "__main__":
     myvar.set_writable()    # Set MyVariable to be writable by clients
     mystringvar = myobj.add_variable(idx, "MyStringVariable", "Really nice string")
     mystringvar.set_writable()    # Set MyVariable to be writable by clients
-    mydtvar = myobj.add_variable(idx, "MyDateTimeVar", datetime.now())
+    mydtvar = myobj.add_variable(idx, "MyDateTimeVar", datetime.utcnow())
     mydtvar.set_writable()    # Set MyVariable to be writable by clients
     myarrayvar = myobj.add_variable(idx, "myarrayvar", [6.7, 7.9])
     myarrayvar = myobj.add_variable(idx, "myStronglytTypedVariable", ua.Variant([], ua.VariantType.UInt32))

opcua/server/history_sql.py

@@ -182,7 +182,7 @@ class HistorySQLite(HistoryStorageInterface):
 
             if period:
                 # after the insert, if a period was specified delete all records older than period
-                date_limit = datetime.now() - period
+                date_limit = datetime.utcnow() - period
 
                 try:
                     _c_sub.execute('DELETE FROM "{tn}" WHERE Time < ?'.format(tn=table),

opcua/ua/uatypes.py

@@ -1060,7 +1060,7 @@ def get_default_value(vtype):
     elif vtype == VariantType.String:
         return None  # a string can be null
     elif vtype == VariantType.DateTime:
-        return datetime.now()
+        return datetime.utcnow()
     elif vtype == VariantType.Guid:
         return uuid.uuid4()
     elif vtype == VariantType.XmlElement:

tests/tests_xml.py

@@ -224,7 +224,7 @@ class XmlTests(object):
         self._test_xml_var_type(o, "guid_array")
 
     def test_xml_datetime(self):
-        o = self.opc.nodes.objects.add_variable(3, "myxmlvar-dt", datetime.datetime.now(), ua.VariantType.DateTime)
+        o = self.opc.nodes.objects.add_variable(3, "myxmlvar-dt", datetime.datetime.utcnow(), ua.VariantType.DateTime)
         self._test_xml_var_type(o, "datetime")
 
     def test_xml_datetime_array(self):