diff --git a/src/util.js b/src/util.js
index d09a82a9..5bf4fd16 100644
--- a/src/util.js
+++ b/src/util.js
@@ -171,7 +171,7 @@ util.convert = function convert(object, type) {
                 return moment(object.valueOf());
             }
             else if (moment.isMoment(object)) {
-                return moment.clone();
+                return moment(moment);
             }
             if (util.isString(object)) {
                 match = ASPDateRegex.exec(object);