diff --git a/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml b/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml
new file mode 100644
index 0000000..35c8004
--- /dev/null
+++ b/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml
@@ -0,0 +1,12 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+             xmlns:u="https://irihi.tech/ursa"
+             mc:Ignorable="d" d:DesignWidth="800"
+             d:DesignHeight="450"
+             x:Class="Ursa.Demo.Pages.DateTimePickerDemo">
+    <StackPanel Margin="20" Spacing="">
+        <u:DateTimePicker Width="300" PanelFormat="hh mm ss tt"/>
+    </StackPanel>
+</UserControl>
diff --git a/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml.cs b/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml.cs
new file mode 100644
index 0000000..2740132
--- /dev/null
+++ b/demo/Ursa.Demo/Pages/DateTimePickerDemo.axaml.cs
@@ -0,0 +1,13 @@
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Markup.Xaml;
+
+namespace Ursa.Demo.Pages;
+
+public partial class DateTimePickerDemo : UserControl
+{
+    public DateTimePickerDemo()
+    {
+        InitializeComponent();
+    }
+}
\ No newline at end of file
diff --git a/demo/Ursa.Demo/ViewModels/DateTimePickerDemoViewModel.cs b/demo/Ursa.Demo/ViewModels/DateTimePickerDemoViewModel.cs
new file mode 100644
index 0000000..637f9ae
--- /dev/null
+++ b/demo/Ursa.Demo/ViewModels/DateTimePickerDemoViewModel.cs
@@ -0,0 +1,6 @@
+namespace Ursa.Demo.ViewModels;
+
+public class DateTimePickerDemoViewModel
+{
+    
+}
\ No newline at end of file
diff --git a/demo/Ursa.Demo/ViewModels/MainViewViewModel.cs b/demo/Ursa.Demo/ViewModels/MainViewViewModel.cs
index 87a92ac..d4af1cb 100644
--- a/demo/Ursa.Demo/ViewModels/MainViewViewModel.cs
+++ b/demo/Ursa.Demo/ViewModels/MainViewViewModel.cs
@@ -36,6 +36,7 @@ public class MainViewViewModel : ViewModelBase
             MenuKeys.MenuKeyClassInput => new ClassInputDemoViewModel(),
             MenuKeys.MenuKeyClock => new ClockDemoViewModel(),
             MenuKeys.MenuKeyDatePicker => new DatePickerDemoViewModel(),
+            MenuKeys.MenuKeyDateTimePicker => new DateTimePickerDemoViewModel(),
             MenuKeys.MenuKeyDialog => new DialogDemoViewModel(),
             MenuKeys.MenuKeyDivider => new DividerDemoViewModel(),
             MenuKeys.MenuKeyDisableContainer => new DisableContainerDemoViewModel(),
diff --git a/demo/Ursa.Demo/ViewModels/MenuViewModel.cs b/demo/Ursa.Demo/ViewModels/MenuViewModel.cs
index bf9bb6e..742989c 100644
--- a/demo/Ursa.Demo/ViewModels/MenuViewModel.cs
+++ b/demo/Ursa.Demo/ViewModels/MenuViewModel.cs
@@ -21,6 +21,7 @@ public class MenuViewModel: ViewModelBase
             new() { MenuHeader = "Class Input", Key = MenuKeys.MenuKeyClassInput },
             new() { MenuHeader = "Clock", Key = MenuKeys.MenuKeyClock, Status = "Updated" },
             new() { MenuHeader = "Date Picker", Key = MenuKeys.MenuKeyDatePicker, Status = "New"},
+            new() { MenuHeader = "Date Time Picker", Key = MenuKeys.MenuKeyDateTimePicker, Status = "New"},
             new() { MenuHeader = "Dialog", Key = MenuKeys.MenuKeyDialog },
             new() { MenuHeader = "Disable Container", Key = MenuKeys.MenuKeyDisableContainer },
             new() { MenuHeader = "Divider", Key = MenuKeys.MenuKeyDivider },
@@ -71,6 +72,7 @@ public static class MenuKeys
     public const string MenuKeyClassInput = "Class Input";
     public const string MenuKeyClock = "Clock";
     public const string MenuKeyDatePicker = "DatePicker";
+    public const string MenuKeyDateTimePicker = "DateTimePicker";
     public const string MenuKeyDialog = "Dialog";
     public const string MenuKeyDivider = "Divider";
     public const string MenuKeyDisableContainer = "DisableContainer";
diff --git a/src/Ursa.Themes.Semi/Controls/DateTimePicker.axaml b/src/Ursa.Themes.Semi/Controls/DateTimePicker.axaml
new file mode 100644
index 0000000..ad0d82f
--- /dev/null
+++ b/src/Ursa.Themes.Semi/Controls/DateTimePicker.axaml
@@ -0,0 +1,141 @@
+<ResourceDictionary xmlns="https://github.com/avaloniaui"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                    xmlns:u="https://irihi.tech/ursa">
+    <!-- Add Resources Here -->
+    <ControlTheme x:Key="{x:Type u:DateTimePicker}" TargetType="u:DateTimePicker">
+        <Setter Property="Background" Value="{DynamicResource CalendarDatePickerBackground}" />
+        <Setter Property="Foreground" Value="{DynamicResource CalendarDatePickerForeground}" />
+        <Setter Property="BorderBrush" Value="{DynamicResource CalendarDatePickerBorderBrush}" />
+        <Setter Property="BorderThickness" Value="{DynamicResource CalendarDatePickerBorderThickness}" />
+        <Setter Property="CornerRadius" Value="{DynamicResource CalendarDatePickerCornerRadius}" />
+        <Setter Property="IsTodayHighlighted" Value="True" />
+        <Setter Property="HorizontalAlignment" Value="Left" />
+        <Setter Property="VerticalAlignment" Value="Center" />
+        <Setter Property="Padding" Value="8 0" />
+        <Setter Property="MinHeight" Value="{DynamicResource CalendarDatePickerDefaultHeight}" />
+        <Setter Property="Template">
+            <ControlTemplate TargetType="u:DateTimePicker">
+                <DataValidationErrors>
+                    <Panel
+                        x:Name="LayoutRoot"
+                        HorizontalAlignment="Stretch"
+                        VerticalAlignment="Stretch">
+                        <Border
+                            x:Name="Background"
+                            Background="{TemplateBinding Background}"
+                            BorderBrush="{TemplateBinding BorderBrush}"
+                            BorderThickness="{TemplateBinding BorderThickness}"
+                            CornerRadius="{TemplateBinding CornerRadius}" />
+                        <Grid
+                            HorizontalAlignment="Stretch"
+                            VerticalAlignment="Stretch"
+                            ColumnDefinitions="*, Auto">
+                            <TextBox
+                                Name="PART_TextBox"
+                                Grid.Column="0"
+                                Grid.ColumnSpan="2"
+                                MinHeight="{TemplateBinding MinHeight}"
+                                HorizontalAlignment="Stretch"
+                                VerticalAlignment="Stretch"
+                                Background="Transparent"
+                                BorderBrush="Transparent"
+                                BorderThickness="0"
+                                CornerRadius="{TemplateBinding CornerRadius}"
+                                FontSize="{TemplateBinding FontSize}"
+                                Foreground="{TemplateBinding Foreground}"
+                                InnerLeftContent="{TemplateBinding InnerLeftContent}"
+                                InnerRightContent="{TemplateBinding InnerRightContent}"
+                                Theme="{DynamicResource LooklessTextBox}"
+                                Watermark="{TemplateBinding Watermark}" />
+                            <Button
+                                Name="ClearButton"
+                                Grid.Column="1"
+                                Padding="0,0,8,0"
+                                Command="{Binding $parent[u:DatePicker].Clear}"
+                                Content="{DynamicResource IconButtonClearData}"
+                                Focusable="False"
+                                IsVisible="False"
+                                Theme="{DynamicResource InnerIconButton}" />
+                            <Button
+                                Name="PART_Button"
+                                Grid.Column="1"
+                                Padding="0,0,8,0"
+                                IsVisible="{Binding !#ClearButton.IsVisible}"
+                                Content="{DynamicResource CalendarDatePickerIconGlyph}"
+                                Focusable="False"
+                                Theme="{DynamicResource InnerIconButton}" />
+                            <Popup
+                                Name="PART_Popup"
+                                Grid.Column="0"
+                                HorizontalOffset="-4"
+                                IsLightDismissEnabled="True"
+                                IsOpen="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropdownOpen, Mode=TwoWay}"
+                                Placement="BottomEdgeAlignedLeft"
+                                PlacementTarget="{TemplateBinding}">
+                                <Border
+                                    Margin="8"
+                                    Padding="8"
+                                    Background="{DynamicResource ComboBoxPopupBackground}"
+                                    BorderBrush="{DynamicResource ComboBoxPopupBorderBrush}"
+                                    BorderThickness="{DynamicResource ComboBoxPopupBorderThickness}"
+                                    BoxShadow="{DynamicResource ComboBoxPopupBoxShadow}"
+                                    CornerRadius="{DynamicResource CalendarCornerRadius}">
+                                    <Grid ColumnDefinitions="*, *">
+                                        <u:CalendarView
+                                            Name="{x:Static u:DateTimePicker.PART_Calendar}"
+                                            BorderThickness="0"
+                                            CornerRadius="{Binding $parent[Border].CornerRadius}"
+                                            FirstDayOfWeek="{TemplateBinding FirstDayOfWeek}"
+                                            FontSize="{DynamicResource DefaultFontSize}"
+                                            IsTodayHighlighted="{TemplateBinding IsTodayHighlighted}" />
+                                        <u:TimePickerPresenter Grid.Column="1"
+                                            Name="{x:Static u:DateTimePicker.PART_TimePicker}"
+                                            FontSize="{DynamicResource DefaultFontSize}"
+                                            NeedsConfirmation="{TemplateBinding NeedConfirmation}"
+                                            PanelFormat="{TemplateBinding PanelFormat}"/>
+                                    </Grid>
+                                </Border>
+                            </Popup>
+                        </Grid>
+
+                    </Panel>
+                </DataValidationErrors>
+            </ControlTemplate>
+        </Setter>
+        
+        <Style Selector="^.clearButton, ^.ClearButton">
+            <Style Selector="^:pointerover /template/ Button#ClearButton">
+                <Setter Property="IsVisible" Value="{Binding $parent[u:DatePicker].SelectedDate, Converter={x:Static ObjectConverters.IsNotNull}}" />
+            </Style>
+        </Style>
+
+        <Style Selector="^:pointerover">
+            <Style Selector="^ /template/ Border#Background">
+                <Setter Property="Background" Value="{DynamicResource CalendarDatePickerPointeroverBackground}" />
+            </Style>
+        </Style>
+
+        <!--  Disabled State  -->
+        <Style Selector="^:disabled">
+            <Style Selector="^ /template/ Border#Background">
+                <Setter Property="Background" Value="{DynamicResource CalendarDatePickerDisabledBackground}" />
+            </Style>
+
+            <Style Selector="^ /template/ Button#PART_Button">
+                <Setter Property="Foreground" Value="{DynamicResource CalendarDatePickerDisabledIconForeground}" />
+            </Style>
+            <Style Selector="^ /template/ TextBox#PART_TextBox">
+                <Setter Property="Background" Value="Transparent" />
+                <Setter Property="BorderBrush" Value="Transparent" />
+            </Style>
+        </Style>
+
+        <!--  Focused State  -->
+        <Style Selector="^:focus /template/ Border#Background">
+            <Setter Property="BorderBrush" Value="{DynamicResource CalendarDatePickerFocusBorderBrush}" />
+        </Style>
+        <Style Selector="^:focus-within /template/ Border#Background">
+            <Setter Property="BorderBrush" Value="{DynamicResource CalendarDatePickerFocusBorderBrush}" />
+        </Style>
+    </ControlTheme>
+</ResourceDictionary>
diff --git a/src/Ursa.Themes.Semi/Controls/_index.axaml b/src/Ursa.Themes.Semi/Controls/_index.axaml
index bec20a1..de5d6f3 100644
--- a/src/Ursa.Themes.Semi/Controls/_index.axaml
+++ b/src/Ursa.Themes.Semi/Controls/_index.axaml
@@ -12,6 +12,7 @@
         <ResourceInclude Source="Clock.axaml" />
         <ResourceInclude Source="DatePicker.axaml" />
         <ResourceInclude Source="DateRangePicker.axaml" />
+        <ResourceInclude Source="DateTimePicker.axaml" />
         <ResourceInclude Source="Dialog.axaml" />
         <ResourceInclude Source="DialogShared.axaml" />
         <ResourceInclude Source="DisableContainer.axaml" />
diff --git a/src/Ursa/Controls/DateTimePicker/CalendarView.cs b/src/Ursa/Controls/DateTimePicker/CalendarView.cs
index 672d15c..faf5705 100644
--- a/src/Ursa/Controls/DateTimePicker/CalendarView.cs
+++ b/src/Ursa/Controls/DateTimePicker/CalendarView.cs
@@ -118,8 +118,17 @@ public class CalendarView : TemplatedControl
         get => GetValue(FirstDayOfWeekProperty);
         set => SetValue(FirstDayOfWeekProperty, value);
     }
-
-    public event EventHandler<CalendarDayButtonEventArgs>? DateSelected;
+    
+    public static readonly RoutedEvent<CalendarDayButtonEventArgs> DateSelectedEvent =
+        RoutedEvent.Register<TimePickerPresenter, CalendarDayButtonEventArgs>(
+            nameof(DateSelected), RoutingStrategies.Bubble);
+    
+    public event EventHandler<CalendarDayButtonEventArgs> DateSelected
+    {
+        add => AddHandler(DateSelectedEvent, value);
+        remove => RemoveHandler(DateSelectedEvent, value);
+    }
+    
     public event EventHandler<CalendarDayButtonEventArgs>? DatePreviewed;
     internal event EventHandler<CalendarContext>? ContextDateChanged; 
 
@@ -420,7 +429,7 @@ public class CalendarView : TemplatedControl
             ContextDate = ContextDate.With(year: e.Date.Value.Year, month: e.Date.Value.Month);
             UpdateDayButtons();
         }
-        DateSelected?.Invoke(this, e);
+        RaiseEvent(new CalendarDayButtonEventArgs(e.Date) { RoutedEvent = DateSelectedEvent, Source = this });
     }
 
     /// <summary>
@@ -531,6 +540,7 @@ public class CalendarView : TemplatedControl
     
     public void MarkDates(DateTime? startDate = null, DateTime? endDate = null, DateTime? previewStartDate = null, DateTime? previewEndDate = null)
     {
+        Debug.WriteLine( startDate + " " + endDate + " " + previewStartDate + " " + previewEndDate);
         _start = startDate;
         _end = endDate;
         _previewStart = previewStartDate;
diff --git a/src/Ursa/Controls/DateTimePicker/DatePicker.cs b/src/Ursa/Controls/DateTimePicker/DatePicker.cs
index 06a1296..69da5b5 100644
--- a/src/Ursa/Controls/DateTimePicker/DatePicker.cs
+++ b/src/Ursa/Controls/DateTimePicker/DatePicker.cs
@@ -63,10 +63,7 @@ public class DatePicker: DatePickerBase, IClearControl
         TextBox.TextChangedEvent.RemoveHandler(OnTextChanged, _textBox);
         PointerPressedEvent.RemoveHandler(OnTextBoxPointerPressed, _textBox);
         Button.ClickEvent.RemoveHandler(OnButtonClick, _button);
-        if (_calendar != null)
-        {
-            _calendar.DateSelected -= OnDateSelected;
-        }
+        CalendarView.DateSelectedEvent.RemoveHandler(OnDateSelected, _calendar);
         
         _button = e.NameScope.Find<Button>(PART_Button);
         e.NameScope.Find<Popup>(PART_Popup);
@@ -77,11 +74,7 @@ public class DatePicker: DatePickerBase, IClearControl
         GotFocusEvent.AddHandler(OnTextBoxGetFocus, _textBox);
         TextBox.TextChangedEvent.AddHandler(OnTextChanged, _textBox);
         PointerPressedEvent.AddHandler(OnTextBoxPointerPressed, RoutingStrategies.Tunnel, false, _textBox);
-        
-        if (_calendar != null)
-        {
-            _calendar.DateSelected += OnDateSelected;
-        }
+        CalendarView.DateSelectedEvent.AddHandler(OnDateSelected, RoutingStrategies.Bubble, true, _calendar);
         SyncSelectedDateToText(SelectedDate);
     }
 
diff --git a/src/Ursa/Controls/DateTimePicker/DateTimePicker.cs b/src/Ursa/Controls/DateTimePicker/DateTimePicker.cs
new file mode 100644
index 0000000..6c52844
--- /dev/null
+++ b/src/Ursa/Controls/DateTimePicker/DateTimePicker.cs
@@ -0,0 +1,282 @@
+using System.Globalization;
+using System.Runtime.CompilerServices;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Controls.Metadata;
+using Avalonia.Controls.Primitives;
+using Avalonia.Data;
+using Avalonia.Input;
+using Avalonia.Interactivity;
+using Irihi.Avalonia.Shared.Helpers;
+
+namespace Ursa.Controls;
+
+[TemplatePart(PART_Button, typeof(Button))]
+[TemplatePart(PART_Popup, typeof(Popup))]
+[TemplatePart(PART_TextBox, typeof(TextBox))]
+[TemplatePart(PART_Calendar, typeof(CalendarView))]
+[TemplatePart(PART_TimePicker, typeof(TimePicker))]
+public class DateTimePicker : DatePickerBase
+{
+    public const string PART_Button = "PART_Button";
+    public const string PART_Popup = "PART_Popup";
+    public const string PART_TextBox = "PART_TextBox";
+    public const string PART_Calendar = "PART_Calendar";
+    public const string PART_TimePicker = "PART_TimePicker";
+
+    public static readonly StyledProperty<DateTime?> SelectedDateProperty =
+        AvaloniaProperty.Register<DateTimePicker, DateTime?>(
+            nameof(SelectedDate), defaultBindingMode: BindingMode.TwoWay);
+
+    public static readonly StyledProperty<string?> WatermarkProperty =
+        AvaloniaProperty.Register<DateTimePicker, string?>(
+            nameof(Watermark));
+
+    public static readonly StyledProperty<string> PanelFormatProperty = AvaloniaProperty.Register<TimePicker, string>(
+        nameof(PanelFormat), "HH mm ss");
+
+    public static readonly StyledProperty<bool> NeedConfirmationProperty = AvaloniaProperty.Register<TimePicker, bool>(
+        nameof(NeedConfirmation));
+
+    private Button? _button;
+    private CalendarView? _calendar;
+    private TextBox? _textBox;
+    private TimePickerPresenter? _timePickerPresenter;
+
+    static DateTimePicker()
+    {
+        DisplayFormatProperty.OverrideDefaultValue<DateTimePicker>(CultureInfo.InvariantCulture.DateTimeFormat.FullDateTimePattern);
+        SelectedDateProperty.Changed.AddClassHandler<DateTimePicker, DateTime?>((picker, args) =>
+            picker.OnSelectionChanged(args));
+    }
+
+    public DateTime? SelectedDate
+    {
+        get => GetValue(SelectedDateProperty);
+        set => SetValue(SelectedDateProperty, value);
+    }
+
+    public string? Watermark
+    {
+        get => GetValue(WatermarkProperty);
+        set => SetValue(WatermarkProperty, value);
+    }
+
+    public string PanelFormat
+    {
+        get => GetValue(PanelFormatProperty);
+        set => SetValue(PanelFormatProperty, value);
+    }
+
+    public bool NeedConfirmation
+    {
+        get => GetValue(NeedConfirmationProperty);
+        set => SetValue(NeedConfirmationProperty, value);
+    }
+
+    private void OnSelectionChanged(AvaloniaPropertyChangedEventArgs<DateTime?> args)
+    {
+        SyncSelectedDateToText(args.NewValue.Value);
+    }
+
+    private void SyncSelectedDateToText(DateTime? date)
+    {
+        if (date is null)
+        {
+            _textBox?.SetValue(TextBox.TextProperty, null);
+            _calendar?.ClearSelection();
+            _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, null);
+        }
+        else
+        {
+            _textBox?.SetValue(TextBox.TextProperty,
+                date.Value.ToString(DisplayFormat ?? CultureInfo.InvariantCulture.DateTimeFormat.FullDateTimePattern));
+            _calendar?.MarkDates(date.Value.Date, date.Value.Date);
+            _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, date.Value.TimeOfDay);
+        }
+    }
+
+    protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
+    {
+        base.OnApplyTemplate(e);
+        GotFocusEvent.RemoveHandler(OnTextBoxGetFocus, _textBox);
+        TextBox.TextChangedEvent.RemoveHandler(OnTextChanged, _textBox);
+        PointerPressedEvent.RemoveHandler(OnTextBoxPointerPressed, _textBox);
+        Button.ClickEvent.RemoveHandler(OnButtonClick, _button);
+        CalendarView.DateSelectedEvent.RemoveHandler(OnDateSelected, _calendar);
+        TimePickerPresenter.SelectedTimeChangedEvent.RemoveHandler(OnTimeSelectedChanged, _timePickerPresenter);
+        _button = e.NameScope.Find<Button>(PART_Button);
+        e.NameScope.Find<Popup>(PART_Popup);
+        _textBox = e.NameScope.Find<TextBox>(PART_TextBox);
+        _calendar = e.NameScope.Find<CalendarView>(PART_Calendar);
+        _timePickerPresenter = e.NameScope.Find<TimePickerPresenter>(PART_TimePicker);
+        Button.ClickEvent.AddHandler(OnButtonClick, RoutingStrategies.Bubble, true, _button);
+        GotFocusEvent.AddHandler(OnTextBoxGetFocus, _textBox);
+        TextBox.TextChangedEvent.AddHandler(OnTextChanged, _textBox);
+        PointerPressedEvent.AddHandler(OnTextBoxPointerPressed, RoutingStrategies.Tunnel, false, _textBox);
+        CalendarView.DateSelectedEvent.AddHandler(OnDateSelected, RoutingStrategies.Bubble, true, _calendar);
+        TimePickerPresenter.SelectedTimeChangedEvent.AddHandler(OnTimeSelectedChanged, _timePickerPresenter);
+        SyncSelectedDateToText(SelectedDate);
+    }
+
+    private void OnDateSelected(object? sender, CalendarDayButtonEventArgs e)
+    {
+        if (SelectedDate is null)
+        {
+            if (e.Date is null) return;
+            var date = e.Date.Value;
+            var time = DateTime.Now.TimeOfDay;
+            SetCurrentValue(SelectedDateProperty,
+                new DateTime(date.Year, date.Month, date.Day, time.Hours, time.Minutes, time.Seconds));
+        }
+        else
+        {
+            var selectedDate = SelectedDate;
+            if (e.Date is null) return;
+            var date = e.Date.Value;
+            SetCurrentValue(SelectedDateProperty,
+                new DateTime(date.Year, date.Month, date.Day, selectedDate.Value.Hour, selectedDate.Value.Minute,
+                    selectedDate.Value.Second));
+        }
+    }
+
+    private void OnTimeSelectedChanged(object sender, TimeChangedEventArgs e)
+    {
+        if (SelectedDate is null)
+        {
+            if (e.NewTime is null) return;
+            var time = e.NewTime.Value;
+            var date = DateTime.Today;
+            SetCurrentValue(SelectedDateProperty,
+                new DateTime(date.Year, date.Month, date.Day, time.Hours, time.Minutes, time.Seconds));
+        }
+        else
+        {
+            var selectedDate = SelectedDate;
+            if (e.NewTime is null) return;
+            var time = e.NewTime.Value;
+            SetCurrentValue(SelectedDateProperty,
+                new DateTime(selectedDate.Value.Year, selectedDate.Value.Month, selectedDate.Value.Day, time.Hours,
+                    time.Minutes,
+                    time.Seconds));
+        }
+    }
+
+    private void OnButtonClick(object? sender, RoutedEventArgs e)
+    {
+        Focus(NavigationMethod.Pointer);
+        SetCurrentValue(IsDropdownOpenProperty, !IsDropdownOpen);
+    }
+
+    private void OnTextBoxPointerPressed(object? sender, PointerPressedEventArgs e)
+    {
+        if (_calendar is not null)
+        {
+            var date = SelectedDate ?? DateTime.Now;
+            _calendar.ContextDate = new CalendarContext(date.Year, date.Month);
+            _calendar.UpdateDayButtons();
+            _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, SelectedDate?.TimeOfDay);
+        }
+
+        SetCurrentValue(IsDropdownOpenProperty, true);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    private void OnTextChanged(object? sender, TextChangedEventArgs e)
+    {
+        SetSelectedDate(true);
+    }
+
+    private void SetSelectedDate(bool fromText = false)
+    {
+        if (string.IsNullOrEmpty(_textBox?.Text))
+        {
+            SetCurrentValue(SelectedDateProperty, null);
+            _calendar?.ClearSelection();
+            _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, null);
+        }
+        else if (DisplayFormat is null || DisplayFormat.Length == 0)
+        {
+            if (DateTime.TryParse(_textBox?.Text, out var defaultTime))
+            {
+                SetCurrentValue(SelectedDateProperty, defaultTime);
+                _calendar?.MarkDates(defaultTime.Date, defaultTime.Date);
+                _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, defaultTime.TimeOfDay);
+            }
+        }
+        else
+        {
+            if (DateTime.TryParseExact(_textBox?.Text, DisplayFormat, CultureInfo.CurrentUICulture, DateTimeStyles.None,
+                    out var date))
+            {
+                SetCurrentValue(SelectedDateProperty, date);
+                if (_calendar is not null)
+                {
+                    _calendar.ContextDate = _calendar.ContextDate.With(date.Year, date.Month);
+                    _calendar.UpdateDayButtons();
+                }
+
+                _calendar?.MarkDates(date.Date, date.Date);
+                _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, date.TimeOfDay);
+            }
+            else
+            {
+                SetCurrentValue(SelectedDateProperty, null);
+                if (!fromText) _textBox?.SetValue(TextBox.TextProperty, null);
+                _calendar?.ClearSelection();
+                _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, null);
+            }
+        }
+    }
+
+    private void OnTextBoxGetFocus(object? sender, GotFocusEventArgs e)
+    {
+        if (_calendar is not null)
+        {
+            var date = SelectedDate ?? DateTime.Today;
+            _calendar.ContextDate = _calendar.ContextDate.With(date.Year, date.Month);
+            _calendar.UpdateDayButtons();
+            _timePickerPresenter?.SetValue(TimePickerPresenter.TimeProperty, date.TimeOfDay);
+        }
+
+        SetCurrentValue(IsDropdownOpenProperty, true);
+    }
+
+    protected override void OnLostFocus(RoutedEventArgs e)
+    {
+        base.OnLostFocus(e);
+        // SetCurrentValue(IsDropdownOpenProperty, false);
+        SetSelectedDate();
+    }
+
+
+    protected override void OnKeyDown(KeyEventArgs e)
+    {
+        if (e.Key == Key.Escape)
+        {
+            SetCurrentValue(IsDropdownOpenProperty, false);
+            e.Handled = true;
+            return;
+        }
+
+        if (e.Key == Key.Down)
+        {
+            SetCurrentValue(IsDropdownOpenProperty, true);
+            e.Handled = true;
+            return;
+        }
+
+        if (e.Key == Key.Tab)
+        {
+            SetCurrentValue(IsDropdownOpenProperty, false);
+            return;
+        }
+
+        base.OnKeyDown(e);
+    }
+
+    public void Clear()
+    {
+        SetCurrentValue(SelectedDateProperty, null);
+    }
+}
\ No newline at end of file