From ac542fbf4923ce6b4a48ddaff0ad776696b0928d Mon Sep 17 00:00:00 2001
From: Tomasz Dobrowolski <tdobrowolski@geocomp.com>
Date: Thu, 8 Mar 2018 15:54:43 -0500
Subject: [PATCH] fix moment-utils startOfDay, endOfDay

The two methods in moment-utils invoke moment().startOf and
moment().endOf which mutate the original value. The call to clone() has
to be added in order to prevent that.
---
 lib/src/utils/moment-utils.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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) {