diff --git a/packages/calendar/src/date-table.vue b/packages/calendar/src/date-table.vue
index 14f1d9c76..6e78cf267 100644
--- a/packages/calendar/src/date-table.vue
+++ b/packages/calendar/src/date-table.vue
@@ -2,7 +2,6 @@
 import fecha from 'element-ui/src/utils/date';
 import { range as rangeArr, getFirstDayOfMonth, getPrevMonthLastDays, getMonthDays, getI18nSettings, validateRangeInOneMonth } from 'element-ui/src/utils/date-util';
 
-const WEEK_DAYS = getI18nSettings().dayNames;
 export default {
   props: {
     selectedDay: String, // formated date yyyy-MM-dd
@@ -21,6 +20,12 @@ export default {
 
   inject: ['elCalendar'],
 
+  data() {
+    return {
+      WEEK_DAYS: getI18nSettings().dayNames
+    };
+  },
+
   methods: {
     toNestedArr(days) {
       return rangeArr(days.length / 7).map((_, index) => {
@@ -142,6 +147,8 @@ export default {
 
     weekDays() {
       const start = this.firstDayOfWeek;
+      const { WEEK_DAYS } = this;
+
       if (typeof start !== 'number' || start === 0) {
         return WEEK_DAYS.slice();
       } else {