Adding XAML Support and Upgrading to TurboModule for Windows

.circleci/config.yml

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   new_arch_ios_build_only:
     executor:
       name: rn/macos
-      xcode_version: '16.2.0'
+      xcode_version: '15.4.0'
       resource_class: macos.m1.medium.gen1
     steps:
       - checkout
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   e2e_release_ios:
     executor:
       name: rn/macos
-      xcode_version: '16.2.0'
+      xcode_version: '15.4.0'
       resource_class: macos.m1.medium.gen1
     steps:
       - checkout

docs/windows-xaml-support.md

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+# Windows XAML Support for React Native DateTimePicker
+
+## Overview
+
+This document describes the XAML-based implementation for Windows platform using React Native's new architecture (Fabric + TurboModules).
+
+## Implementation Details
+
+### Architecture
+
+The Windows implementation now supports both:
+1. **Legacy Architecture**: Using ViewManagers (`DateTimePickerViewManager`, `TimePickerViewManager`)
+2. **New Architecture (Fabric + TurboModules)**: 
+   - **Fabric Components**: Using XAML Islands with `CalendarDatePicker` control for declarative UI
+   - **TurboModules**: Using imperative API similar to Android (`DateTimePickerWindows.open()`)
+
+The implementation automatically selects the appropriate architecture based on the `RNW_NEW_ARCH` compile-time flag.
+
+### Key Components
+
+#### 1. Native Component Spec
+- **File**: `src/specs/DateTimePickerNativeComponent.js` (existing cross-platform spec)
+- Defines the component interface using React Native's codegen
+- Specifies props and events for the component
+
+#### 2. TurboModule Specs
+- **DatePicker**: `src/specs/NativeModuleDatePickerWindows.js`
+- **TimePicker**: `src/specs/NativeModuleTimePickerWindows.js`
+- Follow the same pattern as Android TurboModules
+- Provide imperative API for opening pickers programmatically
+
+#### 3. Codegen Headers
+
+**Fabric Component (New Architecture)**:
+- **File**: `windows/DateTimePickerWindows/codegen/react/components/DateTimePicker/DateTimePicker.g.h`
+- Auto-generated-style header following React Native Windows codegen patterns
+- Defines:
+  - `DateTimePickerProps`: Component properties
+  - `DateTimePickerEventEmitter`: Event handling
+  - `BaseDateTimePicker<T>`: Base template class for the component view
+  - `RegisterDateTimePickerNativeComponent<T>`: Registration helper
+
+**TurboModules (New Architecture)**:
+- **File**: `windows/DateTimePickerWindows/NativeModulesWindows.g.h`
+- Defines specs for both DatePicker and TimePicker TurboModules
+- Includes parameter structs and result structs
+- Follows React Native TurboModule patterns
+
+#### 4. Fabric Implementation
+- **Header**: `windows/DateTimePickerWindows/DateTimePickerFabric.h`
+- **Implementation**: `windows/DateTimePickerWindows/DateTimePickerFabric.cpp`
+- **Component**: `DateTimePickerComponentView`
+  - Implements `BaseDateTimePicker<DateTimePickerComponentView>`
+  - Uses `Microsoft.UI.Xaml.XamlIsland` to host XAML content
+  - Uses `Microsoft.UI.Xaml.Controls.CalendarDatePicker` as the actual picker control
+
+#### 5. TurboModule Implementations
+
+**DatePicker TurboModule**:
+- **Header**: `windows/DateTimePickerWindows/DatePickerModuleWindows.h`
+- **Implementation**: `windows/DateTimePickerWindows/DatePickerModuleWindows.cpp`
+- Provides imperative `open()` and `dismiss()` methods
+- Returns promises with selected date or dismissal action
+
+**TimePicker TurboModule**:
+- **Header**: `windows/DateTimePickerWindows/TimePickerModuleWindows.h`
+- **Implementation**: `windows/DateTimePickerWindows/TimePickerModuleWindows.cpp`
+- Provides imperative `open()` and `dismiss()` methods
+- Returns promises with selected time or dismissal action
+
+#### 6. Package Provider
+- **File**: `windows/DateTimePickerWindows/ReactPackageProvider.cpp`
+- Updated to:
+  - Register Fabric component when `RNW_NEW_ARCH` is defined
+  - Register TurboModules using `AddAttributedModules()` for auto-discovery
+  - Register legacy ViewManagers otherwise
+
+#### 7. JavaScript API
+- **File**: `src/DateTimePickerWindows.windows.js`
+- Provides `DateTimePickerWindows.open()` and `DateTimePickerWindows.dismiss()` methods
+- Similar to `DateTimePickerAndroid` API
+- Exported from main `index.js` for easy access
+
+### XAML Integration
+
+The Fabric implementation uses **XAML Islands** to host native XAML controls within the Composition-based Fabric renderer:
+
+```cpp
+// Initialize XAML Application
+winrt::Microsoft::ReactNative::Xaml::implementation::XamlApplication::EnsureCreated();
+
+// Create XamlIsland
+m_xamlIsland = winrt::Microsoft::UI::Xaml::XamlIsland{};
+
+// Create and set XAML control
+m_calendarDatePicker = winrt::Microsoft::UI::Xaml::Controls::CalendarDatePicker{};
+m_xamlIsland.Content(m_calendarDatePicker);
+
+// Connect to Fabric's ContentIsland
+islandView.Connect(m_xamlIsland.ContentIsland());
+```
+
+### Usage
+
+#### Declarative Component (Fabric)
+
+```javascript
+import DateTimePicker from '@react-native-community/datetimepicker';
+
+<DateTimePicker
+  value={new Date()}
+  mode="date"
+  onChange={handleDateChange}
+/>
+```
+
+#### Imperative API (TurboModules)
+
+```javascript
+import {DateTimePickerWindows} from '@react-native-community/datetimepicker';
+
+// Open date picker
+DateTimePickerWindows.open({
+  value: new Date(),
+  mode: 'date',
+  minimumDate: new Date(2020, 0, 1),
+  maximumDate: new Date(2025, 11, 31),
+  onChange: (event, date) => {
+    if (event.type === 'set') {
+      console.log('Selected date:', date);
+    }
+  },
+  onError: (error) => {
+    console.error('Picker error:', error);
+  }
+});
+
+// Dismiss picker
+DateTimePickerWindows.dismiss();
+```
+
+### Supported Properties
+
+**Fabric Component** supports:
+- `selectedDate`: Current date (milliseconds timestamp)
+- `minimumDate`: Minimum selectable date
+- `maximumDate`: Maximum selectable date
+- `timeZoneOffsetInSeconds`: Timezone offset for date calculations
+- `dayOfWeekFormat`: Format string for day of week display
+- `dateFormat`: Format string for date display
+- `firstDayOfWeek`: First day of the week (0-6)
+- `placeholderText`: Placeholder text when no date is selected
+- `accessibilityLabel`: Accessibility label for the control
+
+**TurboModule API** supports:
+- All the above properties via the `open()` method parameters
+- Returns promises with action results (`dateSetAction`, `dismissedAction`)
+
+### Events
+
+**Fabric Component**:
+- `onChange`: Fired when the date changes
+  - Event payload: `{ newDate: number }` (milliseconds timestamp)
+
+**TurboModule API**:
+- Promise-based: Resolves with `{action, timestamp, utcOffset}` for dates
+- Or `{action, hour, minute}` for times
+
+### Date/Time Conversion
+
+The implementation includes helper functions to convert between JavaScript timestamps (milliseconds) and Windows `DateTime`:
+
+- `DateTimeFrom(milliseconds, timezoneOffset)`: Converts JS timestamp to Windows DateTime
+- `DateTimeToMilliseconds(dateTime, timezoneOffset)`: Converts Windows DateTime to JS timestamp
+
+### Build Configuration
+
+To build with XAML/Fabric/TurboModule support:
+1. Ensure `RNW_NEW_ARCH` is defined in your build configuration
+2. Include the new Fabric and TurboModule implementation files in your project
+3. Link against required XAML libraries
+
+## Comparison with Reference Implementation
+
+This implementation follows the pattern established in the `xaml-calendar-view` sample from the React Native Windows repository (PR #15368), but extends it with TurboModules:
+
+**Similarities**:
+- Uses `XamlIsland` for hosting XAML content
+- Implements codegen-based component registration
+- Uses `ContentIslandComponentView` initializer pattern
+- Follows the `BaseXXXX<T>` template pattern
+
+**Extensions**:
+- **TurboModule Support**: Added imperative API similar to Android
+- **Promise-based API**: Modern async/await pattern for picker operations
+- **Comprehensive property set**: Supports all date/time picker scenarios
+- **Dual architecture**: Works with both legacy and new architecture
+
+**Differences from Android**:
+- Windows uses XAML Islands instead of native Android dialogs
+- Different property names for some platform-specific features
+- Windows TurboModules registered via `AddAttributedModules()`
+
+## Testing
+
+To test the implementation:
+
+**Legacy Architecture**:
+```javascript
+import DateTimePicker from '@react-native-community/datetimepicker';
+// Use as normal component
+```
+
+**New Architecture (Fabric Component)**:
+1. Build with `RNW_NEW_ARCH` enabled
+2. Use the component declaratively as shown above
+
+**New Architecture (TurboModule API)**:
+1. Build with `RNW_NEW_ARCH` enabled
+2. Use `DateTimePickerWindows.open()` imperatively
+
+## Future Enhancements
+
+Potential improvements:
+- Implement ContentDialog/Flyout for better picker presentation
+- Add support for date range pickers
+- Implement state management for complex scenarios
+- Add more XAML-specific styling properties
+- Performance optimizations for rapid prop updates
+- Custom themes and styling support
+
+## References
+
+- [React Native Windows New Architecture](https://microsoft.github.io/react-native-windows/docs/new-architecture)
+- [React Native TurboModules](https://reactnative.dev/docs/the-new-architecture/pillars-turbomodules)
+- [XAML Islands Overview](https://learn.microsoft.com/en-us/windows/apps/desktop/modernize/xaml-islands)
+- [Sample CalendarView PR #15368](https://github.com/microsoft/react-native-windows/pull/15368)