diff --git a/Rally.RestApi/Json/DynamicJsonObject.cs b/Rally.RestApi/Json/DynamicJsonObject.cs
index 73a7bd3..debf39e 100644
--- a/Rally.RestApi/Json/DynamicJsonObject.cs
+++ b/Rally.RestApi/Json/DynamicJsonObject.cs
@@ -122,7 +122,7 @@ private object FormatSetValue(object value)
 			}
 		    if (value is DateTime)
 		    {
-                return ((DateTime)value).ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");
+                return ((DateTime)value).ToUniversalTime().ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fff'Z'");
 		    }
 			throw new ArgumentException("Attempt to set property to an unsupported type.");
 		}