[pickers] Always use the same timezone in the field, the view and the…

… layout components (#13481)

packages/x-date-pickers/src/MobileTimePicker/tests/timezone.MobileTimePicker.test.tsx

@@ -0,0 +1,25 @@
+import * as React from 'react';
+import { screen } from '@mui/internal-test-utils';
+import { describeAdapters } from 'test/utils/pickers';
+import { MobileTimePicker } from '@mui/x-date-pickers/MobileTimePicker';
+import { expect } from 'chai';
+
+describe('<MobileTimePicker /> - Timezone', () => {
+  describeAdapters('Timezone prop', MobileTimePicker, ({ adapter, render }) => {
+    if (!adapter.isTimezoneCompatible) {
+      return;
+    }
+
+    it('should use the timezone prop for the value displayed in the toolbar', () => {
+      render(
+        <MobileTimePicker
+          timezone="America/New_York"
+          value={adapter.date('2022-04-17T15:30', 'default')}
+          open
+        />,
+      );
+
+      expect(screen.getByMuiTest('hours')).to.have.text('11');
+    });
+  });
+});

packages/x-date-pickers/src/PickersLayout/usePickerLayout.tsx

@@ -74,7 +74,6 @@ const usePickerLayout = <
   const classes = useUtilityClasses(props);
 
   // Action bar
-
   const ActionBar = slots?.actionBar ?? PickersActionBar;
   const actionBarProps = useSlotProps({
     elementType: ActionBar,
@@ -93,7 +92,6 @@ const usePickerLayout = <
   const actionBar = <ActionBar {...actionBarProps} />;
 
   // Toolbar
-
   const Toolbar = slots?.toolbar;
   const toolbarProps = useSlotProps({
     elementType: Toolbar!,
@@ -114,19 +112,16 @@ const usePickerLayout = <
   const toolbar = toolbarHasView(toolbarProps) && !!Toolbar ? <Toolbar {...toolbarProps} /> : null;
 
   // Content
-
   const content = children;
 
   // Tabs
-
   const Tabs = slots?.tabs;
   const tabs =
     view && Tabs ? (
       <Tabs view={view} onViewChange={onViewChange} className={classes.tabs} {...slotProps?.tabs} />
     ) : null;
 
   // Shortcuts
-
   const Shortcuts = slots?.shortcuts ?? PickersShortcuts;
   const shortcutsProps = useSlotProps({
     elementType: Shortcuts!,
@@ -144,7 +139,6 @@ const usePickerLayout = <
       wrapperVariant,
     },
   });
-
   const shortcuts = view && !!Shortcuts ? <Shortcuts {...shortcutsProps} /> : null;
 
   return {

packages/x-date-pickers/src/internals/hooks/usePicker/usePickerValue.ts

@@ -165,19 +165,19 @@ export const usePickerValue = <
   const {
     onAccept,
     onChange,
-    value: inValue,
+    value: inValueWithoutRenderTimezone,
     defaultValue: inDefaultValue,
     closeOnSelect = wrapperVariant === 'desktop',
     timezone: timezoneProp,
   } = props;
 
   const { current: defaultValue } = React.useRef(inDefaultValue);
-  const { current: isControlled } = React.useRef(inValue !== undefined);
+  const { current: isControlled } = React.useRef(inValueWithoutRenderTimezone !== undefined);
 
   /* eslint-disable react-hooks/rules-of-hooks, react-hooks/exhaustive-deps */
   if (process.env.NODE_ENV !== 'production') {
     React.useEffect(() => {
-      if (isControlled !== (inValue !== undefined)) {
+      if (isControlled !== (inValueWithoutRenderTimezone !== undefined)) {
         console.error(
           [
             `MUI X: A component is changing the ${
@@ -191,7 +191,7 @@ export const usePickerValue = <
           ].join('\n'),
         );
       }
-    }, [inValue]);
+    }, [inValueWithoutRenderTimezone]);
 
     React.useEffect(() => {
       if (!isControlled && defaultValue !== inDefaultValue) {
@@ -208,13 +208,24 @@ export const usePickerValue = <
 
   const utils = useUtils<TDate>();
   const adapter = useLocalizationContext<TDate>();
-
   const { isOpen, setIsOpen } = useOpenState(props);
 
+  const {
+    timezone,
+    value: inValueWithTimezoneToRender,
+    handleValueChange,
+  } = useValueWithTimezone({
+    timezone: timezoneProp,
+    value: inValueWithoutRenderTimezone,
+    defaultValue,
+    onChange,
+    valueManager,
+  });
+
   const [dateState, setDateState] = React.useState<UsePickerValueState<TValue>>(() => {
     let initialValue: TValue;
-    if (inValue !== undefined) {
-      initialValue = inValue;
+    if (inValueWithTimezoneToRender !== undefined) {
+      initialValue = inValueWithTimezoneToRender;
     } else if (defaultValue !== undefined) {
       initialValue = defaultValue;
     } else {
@@ -225,19 +236,11 @@ export const usePickerValue = <
       draft: initialValue,
       lastPublishedValue: initialValue,
       lastCommittedValue: initialValue,
-      lastControlledValue: inValue,
+      lastControlledValue: inValueWithTimezoneToRender,
       hasBeenModifiedSinceMount: false,
     };
   });
 
-  const { timezone, handleValueChange } = useValueWithTimezone({
-    timezone: timezoneProp,
-    value: inValue,
-    defaultValue,
-    onChange,
-    valueManager,
-  });
-
   useValidation(
     { ...props, value: dateState.draft, timezone },
     validator,
@@ -297,21 +300,29 @@ export const usePickerValue = <
   });
 
   if (
-    inValue !== undefined &&
+    inValueWithTimezoneToRender !== undefined &&
     (dateState.lastControlledValue === undefined ||
-      !valueManager.areValuesEqual(utils, dateState.lastControlledValue, inValue))
+      !valueManager.areValuesEqual(
+        utils,
+        dateState.lastControlledValue,
+        inValueWithTimezoneToRender,
+      ))
   ) {
-    const isUpdateComingFromPicker = valueManager.areValuesEqual(utils, dateState.draft, inValue);
+    const isUpdateComingFromPicker = valueManager.areValuesEqual(
+      utils,
+      dateState.draft,
+      inValueWithTimezoneToRender,
+    );
 
     setDateState((prev) => ({
       ...prev,
-      lastControlledValue: inValue,
+      lastControlledValue: inValueWithTimezoneToRender,
       ...(isUpdateComingFromPicker
         ? {}
         : {
-            lastCommittedValue: inValue,
-            lastPublishedValue: inValue,
-            draft: inValue,
+            lastCommittedValue: inValueWithTimezoneToRender,
+            lastPublishedValue: inValueWithTimezoneToRender,
+            draft: inValueWithTimezoneToRender,
             hasBeenModifiedSinceMount: true,
           }),
     }));