From 623b9dde58d55efd292612b6f7abfe372d3f3af1 Mon Sep 17 00:00:00 2001
From: 梁灏 <admin@aresn.com>
Date: Tue, 18 Sep 2018 11:33:58 +0800
Subject: [PATCH] fixed #3973

---
 src/components/date-picker/panel/Date/date-range.vue | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/components/date-picker/panel/Date/date-range.vue b/src/components/date-picker/panel/Date/date-range.vue
index 4b058f0..f7b4cf1 100644
--- a/src/components/date-picker/panel/Date/date-range.vue
+++ b/src/components/date-picker/panel/Date/date-range.vue
@@ -342,7 +342,10 @@
                 if (!this.splitPanels){
                     const otherPanel = panel === 'left' ? 'right' : 'left';
                     this[`${otherPanel}PanelDate`] = value;
-                    this.changePanelDate(otherPanel, 'Month', 1, false);
+
+                    const increment = otherPanel === 'left' ? -1 : 1; // #3973
+
+                    this.changePanelDate(otherPanel, 'Month', increment, false);
                 }
             },
             handleRangePick (val, type) {
--
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