From 5cea4e3a1bc2307ebd2be37ffa3ace85de84772a Mon Sep 17 00:00:00 2001
From: Roman Rott <roman.rott@gmail.com>
Date: Sat, 15 Oct 2016 14:37:18 +0300
Subject: [PATCH] Fixed issue with rendering calendar incorrectly when first
 day of a month is Sunday

---
 components/date_picker/CalendarDay.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/date_picker/CalendarDay.js b/components/date_picker/CalendarDay.js
index c61ac43e..12829f91 100644
--- a/components/date_picker/CalendarDay.js
+++ b/components/date_picker/CalendarDay.js
@@ -20,8 +20,9 @@ class Day extends Component {
   dayStyle () {
     if (this.props.day === 1) {
       const e = (this.props.sundayFirstDayOfWeek) ? 0 : 1;
+      const firstDay = time.getFirstWeekDay(this.props.viewDate) - e;
       return {
-        marginLeft: `${(time.getFirstWeekDay(this.props.viewDate) - e) * 100 / 7}%`
+        marginLeft: `${ (firstDay >= 0 ? firstDay : 6) * 100 / 7 }%`
       };
     }
   }