diff --git a/pyswagger/primitives.py b/pyswagger/primitives.py
index dbdbd7b..63b3c29 100644
--- a/pyswagger/primitives.py
+++ b/pyswagger/primitives.py
@@ -79,7 +79,7 @@ def __init__(self, _, v):
         """
         self.v = None
         if isinstance(v, float):
-            self.v = datetime.datetime.fromtimestamp(v)
+            self.v = datetime.datetime.utcfromtimestamp(v)
         elif isinstance(v, datetime.datetime):
             self.v = v
         elif isinstance(v, six.string_types):
diff --git a/pyswagger/tests/v2_0/test_prim.py b/pyswagger/tests/v2_0/test_prim.py
index 9481ea9..e0a3ec3 100644
--- a/pyswagger/tests/v2_0/test_prim.py
+++ b/pyswagger/tests/v2_0/test_prim.py
@@ -139,13 +139,13 @@ def test_date_time(self):
         d = self.app.resolve("#/definitions/date-time")
 
         # test input of constructor
-        self.assertEqual(str(d._prim_(float(0))), "1970-01-01T08:00:00")
-        self.assertEqual(str(d._prim_(datetime.datetime.fromtimestamp(0))), "1970-01-01T08:00:00")
-        self.assertEqual(str(d._prim_(datetime.datetime.fromtimestamp(0).isoformat())), "1970-01-01T08:00:00")
+        self.assertEqual(str(d._prim_(float(0))), "1970-01-01T00:00:00")
+        self.assertEqual(str(d._prim_(datetime.datetime.utcfromtimestamp(0))), "1970-01-01T00:00:00")
+        self.assertEqual(str(d._prim_(datetime.datetime.utcfromtimestamp(0).isoformat())), "1970-01-01T00:00:00")
 
         # to_json
         dv = d._prim_(float(0))
-        self.assertEqual(dv.to_json(), "1970-01-01T08:00:00")
+        self.assertEqual(dv.to_json(), "1970-01-01T00:00:00")
 
 
 class HeaderTestCase(unittest.TestCase):