diff --git a/graphene/types/datetime.py b/graphene/types/datetime.py
index 9baa731e..3dfbbb97 100644
--- a/graphene/types/datetime.py
+++ b/graphene/types/datetime.py
@@ -36,4 +36,4 @@ class DateTime(Scalar):
 
     @staticmethod
     def parse_value(value):
-        return datetime.datetime.strptime(value, "%Y-%m-%dT%H:%M:%S.%f")
+        return iso8601.parse_date(value)