diff --git a/addons/hr_holidays/static/tests/test_leave_stats_widget.js b/addons/hr_holidays/static/tests/test_leave_stats_widget.js
index 157459dc61d..e7d2299326d 100644
--- a/addons/hr_holidays/static/tests/test_leave_stats_widget.js
+++ b/addons/hr_holidays/static/tests/test_leave_stats_widget.js
@@ -64,8 +64,8 @@ odoo.define('hr_holidays.leave_stats_widget_tests', function (require) {
                         id: 13,
                         employee_id: 100,
                         department_id: 11,
-                        date_from: "2016-10-2 09:00:00",
-                        date_to:  "2016-10-2 18:00:00",
+                        date_from: "2016-10-02 09:00:00",
+                        date_to:  "2016-10-02 18:00:00",
                         holiday_status_id: 55,
                         state: 'validate',
                         number_of_days: 1,
diff --git a/addons/web/static/src/legacy/js/fields/basic_fields.js b/addons/web/static/src/legacy/js/fields/basic_fields.js
index 16e433da52b..3d4df0cb0a1 100644
--- a/addons/web/static/src/legacy/js/fields/basic_fields.js
+++ b/addons/web/static/src/legacy/js/fields/basic_fields.js
@@ -926,8 +926,8 @@ var FieldDate = InputField.extend({
      * @returns {boolean}
      */
     _isSameValue: function (value) {
-        if (value === false) {
-            return this.value === false;
+        if (this.value === false || value === false) {
+            return this.value === value;
         }
         return value.isSame(this.value, 'day');
     },
@@ -1005,8 +1005,8 @@ var FieldDateTime = FieldDate.extend({
      * @private
      */
     _isSameValue: function (value) {
-        if (value === false) {
-            return this.value === false;
+        if (this.value === false || value === false) {
+            return this.value === value;
         }
         return value.isSame(this.value);
     },
diff --git a/addons/web/static/tests/core/l10n/dates_tests.js b/addons/web/static/tests/core/l10n/dates_tests.js
index 6395b340236..e535bc12688 100644
--- a/addons/web/static/tests/core/l10n/dates_tests.js
+++ b/addons/web/static/tests/core/l10n/dates_tests.js
@@ -59,7 +59,11 @@ function runTestSet(assert, testSet, options) {
     }
 }
 
-QUnit.module("utils", () => {
+
+QUnit.module("utils", {
+        before() {moment.suppressDeprecationWarnings = true;},
+        after() {moment.suppressDeprecationWarnings = false;},
+    }, () => {
     QUnit.module("dates");
 
     QUnit.test("formatDateTime", async (assert) => {
diff --git a/addons/web/static/tests/legacy/components/datepicker_tests.js b/addons/web/static/tests/legacy/components/datepicker_tests.js
index 643bcdb5188..4ab0da28f5d 100644
--- a/addons/web/static/tests/legacy/components/datepicker_tests.js
+++ b/addons/web/static/tests/legacy/components/datepicker_tests.js
@@ -15,9 +15,10 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(8);
 
             const picker = await createComponent(DatePicker, {
-                props: { date: moment('01/09/1997') },
+                props: { date: moment('1997-01-09') },
             });
 
+
             assert.containsOnce(picker, 'input.o_input.o_datepicker_input');
             assert.containsOnce(picker, 'span.o_datepicker_button');
             assert.containsNone(document.body, 'div.bootstrap-datetimepicker-widget');
@@ -46,7 +47,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(5);
 
             const picker = await createComponent(DatePicker, {
-                props: { date: moment('01/09/1997') },
+                props: { date: moment('1997-01-09') },
                 intercepts: {
                     'datetime-changed': ev => {
                         assert.step('datetime-changed');
@@ -106,7 +107,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.verifySteps(['datetime-changed']);
 
             moment.locale(originalLocale);
-            moment.updateLocale('englishForTest', null);
+            moment.updateLocale('frenchForTests', null);
 
             picker.destroy();
         });
@@ -115,7 +116,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(5);
 
             const picker = await createComponent(DatePicker, {
-                props: { date: moment('01/09/1997') },
+                props: { date: moment('1997-01-09') },
                 intercepts: {
                     'datetime-changed': ev => {
                         assert.step('datetime-changed');
@@ -148,7 +149,7 @@ odoo.define('web.datepicker_tests', function (require) {
 
             testUtils.patch(time, { getLangDateFormat: () => "YYYY/MM/DD" });
             const picker = await createComponent(DatePicker, {
-                props: { date: moment('01/09/1997') },
+                props: { date: moment('1997-01-09') },
             });
             const input = picker.el.querySelector('.o_datepicker_input');
 
@@ -169,7 +170,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(11);
 
             const picker = await createComponent(DateTimePicker, {
-                props: { date: moment('01/09/1997 12:30:01') },
+                props: { date: moment('1997-01-09 12:30:01') },
             });
 
             assert.containsOnce(picker, 'input.o_input.o_datepicker_input');
@@ -204,7 +205,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(5);
 
             const picker = await createComponent(DateTimePicker, {
-                props: { date: moment('01/09/1997 12:30:01') },
+                props: { date: moment('1997-01-09 12:30:01') },
                 intercepts: {
                     'datetime-changed': ev => {
                         assert.step('datetime-changed');
@@ -292,7 +293,7 @@ odoo.define('web.datepicker_tests', function (require) {
             assert.expect(9);
 
             const picker = await createComponent(DateTimePicker, {
-                props: { date: moment('01/09/1997 12:30:01') },
+                props: { date: moment('1997-01-09 12:30:01') },
                 intercepts: {
                     'datetime-changed': ev => {
                         assert.step('datetime-changed');
@@ -332,7 +333,7 @@ odoo.define('web.datepicker_tests', function (require) {
 
             testUtils.patch(time, { getLangDatetimeFormat: () => "hh:mm:ss YYYY/MM/DD" });
             const picker = await createComponent(DateTimePicker, {
-                props: { date: moment('01/09/1997 12:30:01') },
+                props: { date: moment('1997-01-09 12:30:01') },
             });
             const input = picker.el.querySelector('.o_datepicker_input');
 
diff --git a/addons/web/static/tests/legacy/views/calendar_tests.js b/addons/web/static/tests/legacy/views/calendar_tests.js
index 753e271c23e..c5beffc08c3 100644
--- a/addons/web/static/tests/legacy/views/calendar_tests.js
+++ b/addons/web/static/tests/legacy/views/calendar_tests.js
@@ -3369,6 +3369,7 @@ QUnit.module('Views', {
             'The day should be in the given locale specific format');
 
         moment.locale(initialLocale);
+        moment.defineLocale('zz', null);
 
         calendar.destroy();
     });