dal parse_date should always return date, issue 1344, thanks Niphlod

VERSION

@@ -1 +1 @@
-Version 2.4.1-alpha.2+timestamp.2013.03.02.12.54.01
+Version 2.4.1-alpha.2+timestamp.2013.03.02.12.55.37

gluon/dal.py

@@ -1890,6 +1890,8 @@ class BaseAdapter(ConnectionPool):
         return value == True or str(value)[:1].lower() == 't'
 
     def parse_date(self, value, field_type):
+        if isinstance(value, datetime.datetime):
+            return value.date()
         if not isinstance(value, (datetime.date,datetime.datetime)):
             (y, m, d) = map(int, str(value)[:10].strip().split('-'))
             value = datetime.date(y, m, d)