diff --git a/api/lib/cmdb/const.py b/api/lib/cmdb/const.py
index e5bfb55..f8bcbc3 100644
--- a/api/lib/cmdb/const.py
+++ b/api/lib/cmdb/const.py
@@ -47,8 +47,8 @@ type_map = {
         Attribute.FLOAT: float,
         Attribute.TEXT: str,
         Attribute.TIME: str,
-        Attribute.DATE: lambda x: x.strftime("%Y%m%d"),
-        Attribute.DATETIME: lambda x: x.strftime("%Y%m%d %H:%M:%S"),
+        Attribute.DATE: lambda x: x.strftime("%Y-%m-%d"),
+        Attribute.DATETIME: lambda x: x.strftime("%Y-%m-%d %H:%M:%S"),
     },
     'serialize2': {
         Attribute.INT: int,
diff --git a/api/lib/database.py b/api/lib/database.py
index 2ac9867..82c6c62 100644
--- a/api/lib/database.py
+++ b/api/lib/database.py
@@ -10,7 +10,9 @@ from api.lib.exception import CommitException
 
 class FormatMixin(object):
     def to_dict(self):
-        return dict([(k.name, getattr(self, k.name)) for k in getattr(self, "__table__").columns])
+        return dict([(k.name,
+                      getattr(self, k.name) if not isinstance(getattr(self, k.name), datetime.datetime) else getattr(
+                          self, k.name).strftime('%Y-%m-%d %H:%M:%S')) for k in getattr(self, "__table__").columns])
 
     @classmethod
     def get_columns(cls):
@@ -18,7 +20,6 @@ class FormatMixin(object):
 
 
 class CRUDMixin(FormatMixin):
-
     @classmethod
     def create(cls, flush=False, **kwargs):
         return cls(**kwargs).save(flush=flush)