From 8168d14e67b4982d5afebb82170c7eb2cfb421e6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=A5=BD=E5=A4=9A=E5=A4=A7=E7=B1=B3?= <lost1q84@gmail.com>
Date: Wed, 9 Jun 2021 17:45:35 +0800
Subject: [PATCH] Calendar: fix first-day-of-week (#21057)

---
 packages/calendar/src/date-table.vue | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/packages/calendar/src/date-table.vue b/packages/calendar/src/date-table.vue
index 715cc3463..aea24e64d 100644
--- a/packages/calendar/src/date-table.vue
+++ b/packages/calendar/src/date-table.vue
@@ -124,7 +124,8 @@ export default {
         let firstDay = getFirstDayOfMonth(date);
         firstDay = firstDay === 0 ? 7 : firstDay;
         const firstDayOfWeek = typeof this.firstDayOfWeek === 'number' ? this.firstDayOfWeek : 1;
-        const prevMonthDays = getPrevMonthLastDays(date, firstDay - firstDayOfWeek).map(day => ({
+        const offset = (7 + firstDay - firstDayOfWeek) % 7;
+        const prevMonthDays = getPrevMonthLastDays(date, offset).map(day => ({
           text: day,
           type: 'prev'
         }));