diff --git a/src/generate/moment.ts b/src/generate/moment.ts
index 08c1e8d69..b09fbf526 100644
--- a/src/generate/moment.ts
+++ b/src/generate/moment.ts
@@ -5,7 +5,7 @@ import { GenerateConfig } from '.';
 const generateConfig: GenerateConfig<Moment> = {
   // get
   getNow: () => moment(),
-  getWeekDay: date => date.clone().locale('en_US').weekday(),
+  getWeekDay: date => date.weekday(),
   getYear: date => date.year(),
   getMonth: date => date.month(),
   getDate: date => date.date(),
diff --git a/src/utils/dateUtil.ts b/src/utils/dateUtil.ts
index 56c428269..3f5498742 100644
--- a/src/utils/dateUtil.ts
+++ b/src/utils/dateUtil.ts
@@ -1,4 +1,3 @@
-import { noteOnce } from 'rc-util/lib/warning';
 import { GenerateConfig } from '../generate';
 import { NullableDateType, PickerMode } from '../interface';
 
@@ -104,8 +103,7 @@ export function isSameWeek<DateType>(
   }
 
   return (
-    generateConfig.locale.getWeek(locale, date1!) ===
-    generateConfig.locale.getWeek(locale, date2!)
+    generateConfig.locale.getWeek(locale, date1!) === generateConfig.locale.getWeek(locale, date2!)
   );
 }
 
@@ -114,10 +112,7 @@ export function isEqual<DateType>(
   value1: NullableDateType<DateType>,
   value2: NullableDateType<DateType>,
 ) {
-  return (
-    isSameDate(generateConfig, value1, value2) &&
-    isSameTime(generateConfig, value1, value2)
-  );
+  return isSameDate(generateConfig, value1, value2) && isSameTime(generateConfig, value1, value2);
 }
 
 /** Between in date but not equal of date */
@@ -144,25 +139,10 @@ export function getWeekStartDate<DateType>(
   generateConfig: GenerateConfig<DateType>,
   value: DateType,
 ) {
-  const weekFirstDay = generateConfig.locale.getWeekFirstDay(locale);
   const monthStartDate = generateConfig.setDate(value, 1);
+  const wd = generateConfig.getWeekDay(monthStartDate);
 
-  for (let i = 0; i < 7; i += 1) {
-    const current = generateConfig.addDate(monthStartDate, -i);
-    if (generateConfig.getWeekDay(current) === weekFirstDay) {
-      return current;
-    }
-  }
-
-  /* istanbul ignore next */
-  /* eslint-disable no-lone-blocks */
-  {
-    noteOnce(
-      false,
-      'Not find week start date. Please check your `generateConfig`. If using default `generateConfig`, please help to fire a issue.',
-    );
-    return value;
-  }
+  return generateConfig.addDate(monthStartDate, -wd);
 }
 
 export function getClosingViewDate<DateType>(
diff --git a/tests/util.spec.tsx b/tests/util.spec.tsx
index 5d89885aa..dc038f5e2 100644
--- a/tests/util.spec.tsx
+++ b/tests/util.spec.tsx
@@ -1,6 +1,7 @@
+import moment from 'moment';
 import momentGenerateConfig from '../src/generate/moment';
 import { toArray } from '../src/utils/miscUtil';
-import { isSameTime, isSameDecade } from '../src/utils/dateUtil';
+import { isSameTime, isSameDecade, getWeekStartDate } from '../src/utils/dateUtil';
 import { getMoment } from './util/commonUtil';
 
 describe('Picker.Util', () => {
@@ -14,31 +15,57 @@ describe('Picker.Util', () => {
   // Time is only for time
   it('isSameTime', () => {
     expect(
-      isSameTime(
-        momentGenerateConfig,
-        getMoment('2000-01-01'),
-        getMoment('1989-11-28'),
-      ),
+      isSameTime(momentGenerateConfig, getMoment('2000-01-01'), getMoment('1989-11-28')),
     ).toBeTruthy();
 
-    expect(
-      isSameTime(momentGenerateConfig, null, getMoment('1989-11-28')),
-    ).toBeFalsy();
+    expect(isSameTime(momentGenerateConfig, null, getMoment('1989-11-28'))).toBeFalsy();
 
     expect(isSameTime(momentGenerateConfig, null, null)).toBeTruthy();
   });
 
   it('isSameDecade', () => {
     expect(isSameDecade(momentGenerateConfig, null, null)).toBeTruthy();
+    expect(isSameDecade(momentGenerateConfig, getMoment('2000-01-02'), null)).toBeFalsy();
     expect(
-      isSameDecade(momentGenerateConfig, getMoment('2000-01-02'), null),
-    ).toBeFalsy();
+      isSameDecade(momentGenerateConfig, getMoment('1995-01-01'), getMoment('1999-01-01')),
+    ).toBeTruthy();
+  });
+
+  it('getWeekStartDate: en', () => {
     expect(
-      isSameDecade(
-        momentGenerateConfig,
-        getMoment('1995-01-01'),
-        getMoment('1999-01-01'),
+      getWeekStartDate('en', momentGenerateConfig, getMoment('2020-03-17').locale('en')).format(
+        'YYYY-MM-DD',
       ),
-    ).toBeTruthy();
+    ).toBe('2020-03-01');
+  });
+
+  it('getWeekStartDate: zh-cn', () => {
+    expect(
+      getWeekStartDate(
+        'zh-cn',
+        momentGenerateConfig,
+        getMoment('2020-03-17').locale('zh-cn'),
+      ).format('YYYY-MM-DD'),
+    ).toBe('2020-02-24');
+  });
+
+  describe('week starts from monday', () => {
+    const defaultWeekStartDate = moment.localeData().firstDayOfWeek();
+    const locale = moment.locale();
+
+    beforeAll(() => {
+      moment.updateLocale(locale, { week: { dow: 1 } });
+    });
+    afterAll(() => {
+      moment.updateLocale(locale, { week: { dow: defaultWeekStartDate } });
+    });
+
+    it('getWeekStartDate', () => {
+      expect(
+        getWeekStartDate(locale, momentGenerateConfig, getMoment('2020-03-17')).format(
+          'YYYY-MM-DD',
+        ),
+      ).toBe('2020-02-24');
+    });
   });
 });