diff --git a/lib/src/utils/moment-utils.js b/lib/src/utils/moment-utils.js
index a499e3ea0..592b4a8f5 100644
--- a/lib/src/utils/moment-utils.js
+++ b/lib/src/utils/moment-utils.js
@@ -40,11 +40,11 @@ export default class MomentUtils {
   }
 
   static startOfDay(date) {
-    return date.startOf('day');
+    return date.clone().startOf('day');
   }
 
   static endOfDay(date) {
-    return date.endOf('day');
+    return date.clone().endOf('day');
   }
 
   static format(date, formatString) {