1) Added a test on https://github.com/Infinidat/infi.clickhouse_orm/issues/66

2) Fixed issue

src/infi/clickhouse_orm/models.py

@@ -57,6 +57,10 @@ class ModelBase(type):
         # Enums
         if db_type.startswith('Enum'):
             return orm_fields.BaseEnumField.create_ad_hoc_field(db_type)
+        # DateTime with timezone
+        if db_type.startswith('DateTime('):
+            # Some functions return DateTimeField with timezone in brackets
+            return orm_fields.DateTimeField()
         # Arrays
         if db_type.startswith('Array'):
             inner_field = cls.create_ad_hoc_field(db_type[6 : -1])

tests/test_datetime_fields.py

@@ -0,0 +1,42 @@
+from __future__ import unicode_literals
+import unittest
+
+from infi.clickhouse_orm.database import Database
+from infi.clickhouse_orm.models import Model
+from infi.clickhouse_orm.fields import *
+from infi.clickhouse_orm.engines import *
+
+
+class DateFieldsTest(unittest.TestCase):
+
+    def setUp(self):
+        self.database = Database('test-db')
+        self.database.create_table(ModelWithDate)
+
+    def tearDown(self):
+        self.database.drop_database()
+
+    def test_ad_hoc_model(self):
+        self.database.insert([
+            ModelWithDate(date_field='2016-08-30', datetime_field='2016-08-30 03:50:00'),
+            ModelWithDate(date_field='2016-08-31', datetime_field='2016-08-31 01:30:00')
+        ])
+
+        # toStartOfHour returns DateTime('Asia/Yekaterinburg') in my case, so I test it here to
+        query = 'SELECT toStartOfHour(datetime_field) as hour_start, * from $db.modelwithdate ORDER BY date_field'
+        results = list(self.database.select(query))
+        self.assertEquals(len(results), 2)
+        self.assertEquals(results[0].date_field, datetime.date(2016, 8, 30))
+        self.assertEquals(results[0].datetime_field, datetime.datetime(2016, 8, 30, 3, 50, 0, tzinfo=pytz.UTC))
+        self.assertEquals(results[0].hour_start, datetime.datetime(2016, 8, 30, 3, 0, 0, tzinfo=pytz.UTC))
+        self.assertEquals(results[1].date_field, datetime.date(2016, 8, 31))
+        self.assertEquals(results[1].datetime_field, datetime.datetime(2016, 8, 31, 1, 30, 0, tzinfo=pytz.UTC))
+        self.assertEquals(results[1].hour_start, datetime.datetime(2016, 8, 31, 1, 0, 0, tzinfo=pytz.UTC))
+
+
+class ModelWithDate(Model):
+
+    date_field = DateField()
+    datetime_field = DateTimeField()
+
+    engine = MergeTree('date_field', ('date_field',))