Handling of all day events and auto calendar sync on account creation.

Wino.Calendar.ViewModels/Data/CalendarItemViewModel.cs

@@ -33,8 +33,10 @@ public partial class CalendarItemViewModel : ObservableObject, ICalendarItem, IC
         }
         set
         {
-            // When setting from UI (in local time), convert to event's timezone for storage.
+            // All-day events use floating dates and should not shift across timezones.
-            CalendarItem.StartDate = value.ToTimeZoneFromLocal(CalendarItem.StartTimeZone);
+            CalendarItem.StartDate = CalendarItem.IsAllDayEvent
+                ? value.Date
+                : value.ToTimeZoneFromLocal(CalendarItem.StartTimeZone);
         }
     }
 

Wino.Core.Domain/Extensions/DateTimeExtensions.cs

@@ -78,8 +78,12 @@ public static class DateTimeExtensions
     }
 
     public static DateTime GetLocalStartDate(this CalendarItem calendarItem)
-        => calendarItem.StartDate.ToLocalTimeFromTimeZone(calendarItem.StartTimeZone);
+        => calendarItem.IsAllDayEvent
+            ? calendarItem.StartDate
+            : calendarItem.StartDate.ToLocalTimeFromTimeZone(calendarItem.StartTimeZone);
 
     public static DateTime GetLocalEndDate(this CalendarItem calendarItem)
-        => calendarItem.EndDate.ToLocalTimeFromTimeZone(calendarItem.EndTimeZone);
+        => calendarItem.IsAllDayEvent
+            ? calendarItem.EndDate
+            : calendarItem.EndDate.ToLocalTimeFromTimeZone(calendarItem.EndTimeZone);
 }

Wino.Core.Tests/Synchronizers/CalendarItemTimeZoneDisplayTests.cs

@@ -0,0 +1,61 @@
+using FluentAssertions;
+using Wino.Calendar.ViewModels.Data;
+using Wino.Core.Extensions;
+using Wino.Core.Domain.Entities.Calendar;
+using Google.Apis.Calendar.v3.Data;
+using Xunit;
+
+namespace Wino.Core.Tests.Synchronizers;
+
+public sealed class CalendarItemTimeZoneDisplayTests
+{
+    [Fact]
+    public void AllDayEvents_KeepTheirOriginalCalendarDates_ForDisplay()
+    {
+        var calendarItem = new CalendarItem
+        {
+            Id = Guid.NewGuid(),
+            Title = "National Sovereignty and Children's Day",
+            StartDate = new DateTime(2026, 4, 23, 0, 0, 0),
+            DurationInSeconds = TimeSpan.FromDays(1).TotalSeconds,
+            StartTimeZone = "Turkey Standard Time",
+            EndTimeZone = "Turkey Standard Time"
+        };
+
+        calendarItem.IsAllDayEvent.Should().BeTrue();
+        calendarItem.LocalStartDate.Should().Be(new DateTime(2026, 4, 23, 0, 0, 0));
+        calendarItem.LocalEndDate.Should().Be(new DateTime(2026, 4, 24, 0, 0, 0));
+    }
+
+    [Fact]
+    public void EditingAllDayEventDate_DoesNotApplyTimezoneConversion()
+    {
+        var calendarItem = new CalendarItem
+        {
+            Id = Guid.NewGuid(),
+            Title = "Holiday",
+            StartDate = new DateTime(2026, 4, 23, 0, 0, 0),
+            DurationInSeconds = TimeSpan.FromDays(1).TotalSeconds,
+            StartTimeZone = "Turkey Standard Time",
+            EndTimeZone = "Turkey Standard Time"
+        };
+
+        var viewModel = new CalendarItemViewModel(calendarItem);
+
+        viewModel.StartDate = new DateTime(2026, 4, 24, 0, 0, 0);
+
+        calendarItem.StartDate.Should().Be(new DateTime(2026, 4, 24, 0, 0, 0));
+    }
+
+    [Fact]
+    public void GmailDateOnlyEvents_KeepFloatingCalendarDates()
+    {
+        var start = new EventDateTime { Date = "2026-04-23" };
+        var end = new EventDateTime { Date = "2026-04-24" };
+
+        GoogleIntegratorExtensions.GetEventLocalDateTime(start).Should().Be(new DateTime(2026, 4, 23, 0, 0, 0));
+        GoogleIntegratorExtensions.GetEventLocalDateTime(end).Should().Be(new DateTime(2026, 4, 24, 0, 0, 0));
+
+        GoogleIntegratorExtensions.GetEventDateTimeOffset(start)!.Value.UtcDateTime.Should().Be(new DateTime(2026, 4, 23, 0, 0, 0, DateTimeKind.Utc));
+    }
+}

Wino.Core/Extensions/GoogleIntegratorExtensions.cs

@@ -180,6 +180,31 @@ public static class GoogleIntegratorExtensions
         return null;
     }
 
+    public static DateTime? GetEventLocalDateTime(EventDateTime calendarEvent)
+    {
+        if (calendarEvent == null)
+        {
+            return null;
+        }
+
+        if (calendarEvent.DateTimeDateTimeOffset != null)
+        {
+            return DateTime.SpecifyKind(calendarEvent.DateTimeDateTimeOffset.Value.DateTime, DateTimeKind.Unspecified);
+        }
+
+        if (calendarEvent.Date != null)
+        {
+            if (DateTime.TryParse(calendarEvent.Date, out DateTime eventDateTime))
+            {
+                return DateTime.SpecifyKind(eventDateTime, DateTimeKind.Unspecified);
+            }
+
+            throw new Exception("Invalid date format in Google Calendar event date.");
+        }
+
+        return null;
+    }
+
     /// <summary>
     /// Extracts the timezone string from EventDateTime.
     /// Returns null for all-day events or if timezone is not specified.

Wino.Core/Extensions/OutlookIntegratorExtensions.cs

@@ -335,6 +335,21 @@ public static class OutlookIntegratorExtensions
         }
     }
 
+    public static DateTime GetLocalDateTimeFromDateTimeTimeZone(DateTimeTimeZone dateTimeTimeZone)
+    {
+        if (dateTimeTimeZone == null || string.IsNullOrEmpty(dateTimeTimeZone.DateTime))
+        {
+            throw new ArgumentException("DateTimeTimeZone or DateTime is null or empty.");
+        }
+
+        if (!DateTime.TryParse(dateTimeTimeZone.DateTime, out DateTime parsedDateTime))
+        {
+            throw new ArgumentException("DateTime string is not in a valid format.");
+        }
+
+        return DateTime.SpecifyKind(parsedDateTime, DateTimeKind.Unspecified);
+    }
+
     private static AttendeeStatus GetAttendeeStatus(ResponseType? responseType)
     {
         return responseType switch

Wino.Core/Integration/Processors/GmailChangeProcessor.cs

@@ -66,12 +66,14 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
             // We don't have this event yet. Create a new one.
             var eventStartDateTimeOffset = GoogleIntegratorExtensions.GetEventDateTimeOffset(calendarEvent.Start);
             var eventEndDateTimeOffset = GoogleIntegratorExtensions.GetEventDateTimeOffset(calendarEvent.End);
+            var eventStartLocalDateTime = GoogleIntegratorExtensions.GetEventLocalDateTime(calendarEvent.Start);
+            var eventEndLocalDateTime = GoogleIntegratorExtensions.GetEventLocalDateTime(calendarEvent.End);
 
             double totalDurationInSeconds = 0;
 
-            if (eventStartDateTimeOffset != null && eventEndDateTimeOffset != null)
+            if (eventStartLocalDateTime != null && eventEndLocalDateTime != null)
             {
-                totalDurationInSeconds = (eventEndDateTimeOffset.Value - eventStartDateTimeOffset.Value).TotalSeconds;
+                totalDurationInSeconds = (eventEndLocalDateTime.Value - eventStartLocalDateTime.Value).TotalSeconds;
             }
 
             CalendarItem calendarItem = null;
@@ -97,7 +99,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     CreatedAt = DateTimeOffset.UtcNow,
                     Description = calendarEvent.Description ?? parentRecurringEvent.Description,
                     Id = Guid.NewGuid(),
-                    StartDate = eventStartDateTimeOffset.Value.UtcDateTime,
+                    StartDate = eventStartLocalDateTime.Value,
                     DurationInSeconds = totalDurationInSeconds,
                     Location = string.IsNullOrEmpty(calendarEvent.Location) ? parentRecurringEvent.Location : calendarEvent.Location,
 
@@ -136,7 +138,7 @@ public class GmailChangeProcessor : DefaultChangeProcessor, IGmailChangeProcesso
                     CreatedAt = DateTimeOffset.UtcNow,
                     Description = calendarEvent.Description,
                     Id = Guid.NewGuid(),
-                    StartDate = eventStartDateTimeOffset.Value.UtcDateTime,
+                    StartDate = eventStartLocalDateTime.Value,
                     DurationInSeconds = totalDurationInSeconds,
                     Location = calendarEvent.Location,
 

Wino.Core/Integration/Processors/OutlookChangeProcessor.cs

@@ -59,14 +59,15 @@ public class OutlookChangeProcessor(IDatabaseService databaseService,
             savingItem = new CalendarItem() { Id = savingItemId };
         }
 
-        DateTimeOffset eventStartDateTimeOffset = OutlookIntegratorExtensions.GetDateTimeOffsetFromDateTimeTimeZone(calendarEvent.Start);
+        var eventStartLocalDateTime = OutlookIntegratorExtensions.GetLocalDateTimeFromDateTimeTimeZone(calendarEvent.Start);
-        DateTimeOffset eventEndDateTimeOffset = OutlookIntegratorExtensions.GetDateTimeOffsetFromDateTimeTimeZone(calendarEvent.End);
+        var eventEndLocalDateTime = OutlookIntegratorExtensions.GetLocalDateTimeFromDateTimeTimeZone(calendarEvent.End);
 
-        var durationInSeconds = (eventEndDateTimeOffset - eventStartDateTimeOffset).TotalSeconds;
+        var durationInSeconds = (eventEndLocalDateTime - eventStartLocalDateTime).TotalSeconds;
 
-        // Store dates as UTC in the database
+        // Store the wall-clock values exactly as Outlook returned them for the event timezone.
+        // Timed events are converted for display later, while all-day events stay as floating dates.
         savingItem.RemoteEventId = calendarEvent.Id.WithClientTrackingId(calendarEvent.TransactionId.GetClientTrackingId());
-        savingItem.StartDate = eventStartDateTimeOffset.UtcDateTime;
+        savingItem.StartDate = eventStartLocalDateTime;
         savingItem.DurationInSeconds = durationInSeconds;
 
         // Store the timezone information from the event

Wino.Mail.ViewModels/MailAppShellViewModel.cs

@@ -87,6 +87,7 @@ public partial class MailAppShellViewModel : MailBaseViewModel,
     private readonly INativeAppService _nativeAppService;
     private readonly IMailService _mailService;
     private bool _hasRegisteredPersistentRecipients;
+    private readonly SemaphoreSlim _menuRefreshSemaphore = new(1, 1);
 
     private readonly SemaphoreSlim accountInitFolderUpdateSlim = new SemaphoreSlim(1);
 
@@ -970,13 +971,21 @@ public partial class MailAppShellViewModel : MailBaseViewModel,
 
     private async Task RecreateMenuItemsAsync()
     {
-        await ExecuteUIThread(() =>
+        await _menuRefreshSemaphore.WaitAsync().ConfigureAwait(false);
+        try
         {
-            MenuItems.Clear();
+            await ExecuteUIThread(() =>
-            MenuItems.Add(CreateMailMenuItem);
+            {
-        });
+                MenuItems.Clear();
+                MenuItems.Add(CreateMailMenuItem);
+            });
 
-        await LoadAccountsAsync();
+            await LoadAccountsAsync();
+        }
+        finally
+        {
+            _menuRefreshSemaphore.Release();
+        }
     }
 
     private async Task RestoreSelectedAccountAfterMenuRefreshAsync(bool automaticallyNavigateFirstItem)

Wino.Mail.WinUI/App.xaml.cs

@@ -239,6 +239,13 @@ public partial class App : WinoApplication,
         if (windowManager.GetWindow(WinoWindowKind.Shell) is not ShellWindow shellWindow)
             return;
 
+        windowManager.HideWindow(shellWindow);
+        if (ReferenceEquals(MainWindow, shellWindow))
+        {
+            MainWindow = null;
+            InitializeNavigationDispatcher();
+        }
+
         shellWindow.PrepareForClose();
         shellWindow.Close();
     }
@@ -748,7 +755,7 @@ public partial class App : WinoApplication,
     /// Creates the main window without activating it.
     /// Used for both normal launch and startup task launch (tray only).
     /// </summary>
-    private void CreateWindow(Microsoft.UI.Xaml.LaunchActivatedEventArgs? args)
+    private void CreateWindow(Microsoft.UI.Xaml.LaunchActivatedEventArgs? args, string? forcedLaunchArguments = null)
     {
         LogActivation("Creating main window.");
 
@@ -761,6 +768,12 @@ public partial class App : WinoApplication,
 
         windowManager.SetPrimaryNavigationFrame(WinoWindowKind.Shell, shellWindow.GetMainFrame());
 
+        if (!string.IsNullOrWhiteSpace(forcedLaunchArguments))
+        {
+            shellWindow.HandleAppActivation(forcedLaunchArguments);
+            return;
+        }
+
         var activationArgs = AppInstance.GetCurrent().GetActivatedEventArgs();
 
         if (activationArgs.Kind == ExtendedActivationKind.Launch &&
@@ -902,7 +915,6 @@ public partial class App : WinoApplication,
         _hasConfiguredAccounts = true;
 
         var windowManager = Services.GetRequiredService<IWinoWindowManager>();
-        var navigationService = Services.GetRequiredService<INavigationService>();
 
         // Only transition when the account was created from the WelcomeWindow.
         if (windowManager.GetWindow(WinoWindowKind.Welcome) == null)
@@ -911,12 +923,20 @@ public partial class App : WinoApplication,
         MainWindow?.DispatcherQueue?.TryEnqueue(async () =>
         {
             // Create and activate ShellWindow — ActiveWindowChanged fires and rebinds the dispatcher.
-            CreateWindow(null);
+            CreateWindow(null, GetModeLaunchArgument(WinoApplicationMode.Mail));
             CloseWelcomeWindowIfPresent();
-            navigationService.ChangeApplicationMode(Core.Domain.Enums.WinoApplicationMode.Mail);
             if (MainWindow != null)
                 await ActivateWindowAsync(MainWindow);
 
+            if (message.Account.IsCalendarAccessGranted)
+            {
+                WeakReferenceMessenger.Default.Send(new NewCalendarSynchronizationRequested(new CalendarSynchronizationOptions
+                {
+                    AccountId = message.Account.Id,
+                    Type = CalendarSynchronizationType.CalendarEvents
+                }));
+            }
+
             RestartAutoSynchronizationLoop();
         });
     }

Wino.Mail.WinUI/Controls/Calendar/CalendarItemControl.xaml

@@ -159,8 +159,11 @@
                 <!--  All-Day template for top area.  -->
                 <VisualState x:Name="AllDayEvent">
                     <VisualState.Setters>
-
+                        <Setter Target="EventTitleTextblock.HorizontalAlignment" Value="Stretch" />
+                        <Setter Target="EventTitleTextblock.HorizontalTextAlignment" Value="Left" />
+                        <Setter Target="EventTitleTextblock.Margin" Value="6,0" />
                         <Setter Target="AttributeStack.VerticalAlignment" Value="Center" />
+                        <Setter Target="AttributeStack.Margin" Value="0,0,4,0" />
                         <Setter Target="MainGrid.MinHeight" Value="30" />
                         <Setter Target="MainBorder.StrokeThickness" Value="0" />
                     </VisualState.Setters>

Wino.Mail.WinUI/Controls/Calendar/CalendarPeriodControl.xaml

@@ -52,6 +52,7 @@
     <Grid>
         <Grid x:Name="TimedRoot" Visibility="Collapsed">
             <Grid.RowDefinitions>
+                <RowDefinition Height="Auto" />
                 <RowDefinition Height="Auto" />
                 <RowDefinition Height="*" />
             </Grid.RowDefinitions>
@@ -88,8 +89,29 @@
                 </ItemsControl>
             </Grid>
 
-            <Grid
+            <Border
+                x:Name="TimedAllDayCornerHost"
                 Grid.Row="1"
+                Grid.Column="0"
+                Height="{x:Bind TimedAllDayHeight, Mode=OneWay}"
+                Background="{ThemeResource LayerFillColorDefaultBrush}"
+                BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
+                BorderThickness="0,0,1,1"
+                Visibility="{x:Bind HasTimedAllDayItems, Mode=OneWay}" />
+
+            <Grid
+                x:Name="TimedAllDayHost"
+                Grid.Row="1"
+                Grid.Column="1"
+                Height="{x:Bind TimedAllDayHeight, Mode=OneWay}"
+                Background="{ThemeResource LayerFillColorDefaultBrush}"
+                Visibility="{x:Bind HasTimedAllDayItems, Mode=OneWay}">
+                <skia:SKXamlCanvas x:Name="TimedAllDayCanvas" PaintSurface="TimedAllDayCanvasPaintSurface" />
+                <Canvas x:Name="TimedAllDayItemsCanvas" />
+            </Grid>
+
+            <Grid
+                Grid.Row="2"
                 Grid.ColumnSpan="2"
                 Background="Transparent">
                 <ScrollViewer

Wino.Mail.WinUI/Controls/Calendar/CalendarPeriodControl.xaml.cs

@@ -51,6 +51,7 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
     private MonthCalendarLayoutResult _monthLayout = new(0, 0, [], []);
     private INotifyCollectionChanged? _observableItemsSource;
     private double _timedDayWidth;
+    private double _timedAllDayHeight;
     private double _monthCellWidth;
     private double _monthCellHeight;
     private bool _hasPresentedState;
@@ -101,12 +102,14 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
     private ObservableCollection<HeaderTextLayout> TimedHeaderTextsCollection { get; } = [];
     private ObservableCollection<HeaderTextLayout> MonthHeaderTextsCollection { get; } = [];
     private ObservableCollection<TimedItemLayout> TimedItemsCollection { get; } = [];
+    private ObservableCollection<TimedItemLayout> TimedAllDayItemsCollection { get; } = [];
     private ObservableCollection<MonthCellLabelLayout> MonthCellLabelsCollection { get; } = [];
     private ObservableCollection<MonthItemLayout> MonthItemsCollection { get; } = [];
 
     public IEnumerable<HeaderTextLayout> TimedHeaderTexts => TimedHeaderTextsCollection;
     public IEnumerable<HeaderTextLayout> MonthHeaderTexts => MonthHeaderTextsCollection;
     public IEnumerable<TimedItemLayout> TimedItems => TimedItemsCollection;
+    public IEnumerable<TimedItemLayout> TimedAllDayItems => TimedAllDayItemsCollection;
     public IEnumerable<MonthCellLabelLayout> MonthCellLabels => MonthCellLabelsCollection;
     public IEnumerable<MonthItemLayout> MonthItems => MonthItemsCollection;
 
@@ -155,6 +158,24 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
         }
     }
 
+    public double TimedAllDayHeight
+    {
+        get => _timedAllDayHeight;
+        private set
+        {
+            if (_timedAllDayHeight == value)
+            {
+                return;
+            }
+
+            _timedAllDayHeight = value;
+            OnPropertyChanged();
+            OnPropertyChanged(nameof(HasTimedAllDayItems));
+        }
+    }
+
+    public bool HasTimedAllDayItems => TimedAllDayHeight > 0d;
+
     public double TimelineHeight => TimedCalendarLayoutCalculator.GetTimelineHeight(GetHourHeight());
 
     partial void OnVisibleRangeChanged(VisibleDateRange? newValue) => RequestRefresh();
@@ -309,9 +330,14 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
         var timedSurfaceWidth = GetTimedSurfaceWidth();
 
         TimedDayWidth = _currentRange.Dates.Count == 0 ? 0d : timedSurfaceWidth / _currentRange.Dates.Count;
+        TimedAllDayHeight = TimedCalendarLayoutCalculator.GetAllDayHeight(
+            TimedCalendarLayoutCalculator.GetAllDayLaneCount(_currentRange.Dates, CurrentItems));
         TimedScrollContentGrid.Width = ActualWidth;
         TimedViewport.Width = timedSurfaceWidth;
         TimedViewport.Height = TimelineHeight;
+        TimedAllDayHost.Width = timedSurfaceWidth;
+        TimedAllDayItemsCanvas.Width = timedSurfaceWidth;
+        TimedAllDayItemsCanvas.Height = TimedAllDayHeight;
 
         _timedLayout = TimedCalendarLayoutCalculator.Calculate(_currentRange, CurrentItems, timedSurfaceWidth, GetHourHeight());
 
@@ -323,6 +349,12 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
                     TimedDayWidth)));
 
         var eventTemplate = (DataTemplate)Resources["CalendarEventTemplate"];
+        ReplaceCollection(TimedAllDayItemsCollection, TimedCalendarLayoutCalculator.CalculateAllDayItems(_currentRange, CurrentItems, timedSurfaceWidth).Select(item =>
+        {
+            PrepareDisplayMetadata(item.Item, item.Date);
+            item.Template = eventTemplate;
+            return item;
+        }));
         ReplaceCollection(TimedItemsCollection, _timedLayout.Items.Select(item =>
         {
             PrepareDisplayMetadata(item.Item, item.Date);
@@ -330,8 +362,10 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
             return item;
         }));
         RenderHourLabels();
+        RenderTimedAllDayItems();
         RenderTimedItems();
 
+        TimedAllDayCanvas.Invalidate();
         TimedHeaderCanvas.Invalidate();
         TimedStructureCanvas.Invalidate();
     }
@@ -470,6 +504,32 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
         canvas.DrawLine(0, height - 1, e.Info.Width, height - 1, borderPaint);
     }
 
+    private void TimedAllDayCanvasPaintSurface(object? sender, SKPaintSurfaceEventArgs e)
+    {
+        using var borderPaint = CreateLinePaint();
+        var canvas = e.Surface.Canvas;
+        canvas.Clear(SKColors.Transparent);
+
+        var timedSurfaceWidth = GetTimedSurfaceWidth();
+
+        if (_timedLayout.VisibleDates.Count == 0 || timedSurfaceWidth <= 0 || TimedAllDayHeight <= 0)
+        {
+            return;
+        }
+
+        var scaleX = (float)(e.Info.Width / timedSurfaceWidth);
+        var height = e.Info.Height;
+        var dayWidth = (float)(_timedLayout.DayWidth * scaleX);
+
+        for (var index = 1; index < _timedLayout.VisibleDates.Count; index++)
+        {
+            var x = dayWidth * index;
+            canvas.DrawLine(x, 0, x, height, borderPaint);
+        }
+
+        canvas.DrawLine(0, height - 1, e.Info.Width, height - 1, borderPaint);
+    }
+
     private void TimedStructureCanvasPaintSurface(object? sender, SKPaintSurfaceEventArgs e)
     {
         using var linePaint = CreateLinePaint();
@@ -645,6 +705,26 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
         }
     }
 
+    private void RenderTimedAllDayItems()
+    {
+        TimedAllDayItemsCanvas.Children.Clear();
+
+        foreach (var item in TimedAllDayItemsCollection)
+        {
+            var presenter = new ContentPresenter
+            {
+                Width = item.Bounds.Width,
+                Height = item.Bounds.Height,
+                Content = item.Item,
+                ContentTemplate = item.Template
+            };
+
+            Canvas.SetLeft(presenter, item.Bounds.X);
+            Canvas.SetTop(presenter, item.Bounds.Y);
+            TimedAllDayItemsCanvas.Children.Add(presenter);
+        }
+    }
+
     private void RenderMonthCellLabels()
     {
         MonthCellLabelsCanvas.Children.Clear();
@@ -897,6 +977,7 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
     private void ResetTimedVisualState()
     {
         ResetAnimatedElement(TimedScrollViewer);
+        ResetAnimatedElement(TimedAllDayHost);
     }
 
     private static void StartNavigationTransition(Compositor compositor, Visual visual, int direction, double width)
@@ -926,6 +1007,10 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
         var clipInset = (float)Math.Max(18d, Math.Min(64d, width * 0.05d));
 
         StartTimedElementTransition(compositor, TimedScrollViewer, signedTravel, 0f, 0.68f, TimeSpan.FromMilliseconds(240), direction >= 0 ? 0f : clipInset, direction >= 0 ? clipInset : 0f, animateScale: false);
+        if (HasTimedAllDayItems)
+        {
+            StartTimedElementTransition(compositor, TimedAllDayHost, signedTravel, 0f, 0.68f, TimeSpan.FromMilliseconds(240), direction >= 0 ? 0f : clipInset, direction >= 0 ? clipInset : 0f, animateScale: false);
+        }
     }
 
     private static void StartModeTransition(Compositor compositor, Visual visual)
@@ -953,6 +1038,10 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
     private void StartTimedModeTransition(Compositor compositor)
     {
         StartTimedElementTransition(compositor, TimedScrollViewer, 0f, 18f, 0f, TimeSpan.FromMilliseconds(240), 0f, 0f, animateScale: false);
+        if (HasTimedAllDayItems)
+        {
+            StartTimedElementTransition(compositor, TimedAllDayHost, 0f, 18f, 0f, TimeSpan.FromMilliseconds(240), 0f, 0f, animateScale: false);
+        }
     }
 
     private static void StartRefreshTransition(Compositor compositor, Visual visual)
@@ -968,6 +1057,10 @@ public sealed partial class CalendarPeriodControl : UserControl, INotifyProperty
     private void StartTimedRefreshTransition(Compositor compositor)
     {
         StartOpacityTransition(compositor, ElementCompositionPreview.GetElementVisual(TimedScrollViewer), 0.8f, TimeSpan.FromMilliseconds(160));
+        if (HasTimedAllDayItems)
+        {
+            StartOpacityTransition(compositor, ElementCompositionPreview.GetElementVisual(TimedAllDayHost), 0.8f, TimeSpan.FromMilliseconds(160));
+        }
     }
 
     private static void PrepareAnimatedVisual(Visual visual, UIElement target)

Wino.Mail.WinUI/Controls/Calendar/TimedCalendarLayout.cs

@@ -29,8 +29,24 @@ internal sealed record TimedCalendarLayoutResult(IReadOnlyList<DateOnly> Visible
 
 internal static class TimedCalendarLayoutCalculator
 {
+    private const double AllDayItemHeight = 28d;
+    private const double AllDayItemGap = 4d;
+    private const double AllDaySectionPadding = 6d;
+
     public static double GetTimelineHeight(double hourHeight) => hourHeight * 24d;
 
+    public static double GetAllDayHeight(int laneCount)
+    {
+        if (laneCount <= 0)
+        {
+            return 0d;
+        }
+
+        return (AllDaySectionPadding * 2d) +
+               (laneCount * AllDayItemHeight) +
+               ((laneCount - 1) * AllDayItemGap);
+    }
+
     public static TimedCalendarLayoutResult Calculate(VisibleDateRange range, IEnumerable<CalendarItemViewModel> items, double availableWidth, double hourHeight)
     {
         var visibleDates = range.Dates;
@@ -79,6 +95,11 @@ internal static class TimedCalendarLayoutCalculator
                 continue;
             }
 
+            if (item.IsAllDayEvent)
+            {
+                continue;
+            }
+
             var localStart = start.LocalDateTime;
             var localEnd = end.LocalDateTime;
 
@@ -101,6 +122,50 @@ internal static class TimedCalendarLayoutCalculator
         return segments;
     }
 
+    public static IReadOnlyList<TimedItemLayout> CalculateAllDayItems(VisibleDateRange range, IEnumerable<CalendarItemViewModel> items, double availableWidth)
+    {
+        var visibleDates = range.Dates;
+        var dayWidth = visibleDates.Count == 0 ? 0d : availableWidth / visibleDates.Count;
+        var layouts = new List<TimedItemLayout>();
+
+        for (var dayIndex = 0; dayIndex < visibleDates.Count; dayIndex++)
+        {
+            var date = visibleDates[dayIndex];
+            var dayItems = BuildAllDayItems(items, date)
+                .OrderBy(item => item.StartDate)
+                .ThenBy(item => item.EndDate)
+                .ThenBy(item => item.Title)
+                .ToList();
+
+            for (var rowIndex = 0; rowIndex < dayItems.Count; rowIndex++)
+            {
+                var y = AllDaySectionPadding + (rowIndex * (AllDayItemHeight + AllDayItemGap));
+                var x = (dayIndex * dayWidth) + 2d;
+                var width = Math.Max(0d, dayWidth - 4d);
+
+                layouts.Add(new TimedItemLayout(
+                    dayItems[rowIndex],
+                    dayIndex,
+                    date,
+                    new LayoutRect(x, y, width, AllDayItemHeight)));
+            }
+        }
+
+        return layouts;
+    }
+
+    public static int GetAllDayLaneCount(IReadOnlyList<DateOnly> visibleDates, IEnumerable<CalendarItemViewModel> items)
+    {
+        var laneCount = 0;
+
+        foreach (var date in visibleDates)
+        {
+            laneCount = Math.Max(laneCount, BuildAllDayItems(items, date).Count);
+        }
+
+        return laneCount;
+    }
+
     private static IEnumerable<List<Segment>> BuildClusters(List<Segment> segments)
     {
         if (segments.Count == 0)
@@ -130,6 +195,41 @@ internal static class TimedCalendarLayoutCalculator
         yield return cluster;
     }
 
+    private static List<CalendarItemViewModel> BuildAllDayItems(IEnumerable<CalendarItemViewModel> items, DateOnly date)
+    {
+        var dayStart = date.ToDateTime(TimeOnly.MinValue);
+        var dayEnd = dayStart.AddDays(1);
+        var allDayItems = new List<CalendarItemViewModel>();
+
+        foreach (var item in items)
+        {
+            if (!item.IsAllDayEvent)
+            {
+                continue;
+            }
+
+            if (!CalendarItemAccessor.TryGetTimeRange(item, out var start, out var end))
+            {
+                continue;
+            }
+
+            var localStart = start.LocalDateTime;
+            var localEnd = end.LocalDateTime;
+
+            if (localEnd <= localStart)
+            {
+                continue;
+            }
+
+            if (localStart < dayEnd && localEnd > dayStart)
+            {
+                allDayItems.Add(item);
+            }
+        }
+
+        return allDayItems;
+    }
+
     private static void AssignColumns(List<Segment> segments)
     {
         var columnEnds = new List<double>();

Wino.Mail.WinUI/Services/NewThemeService.cs

@@ -189,14 +189,7 @@ public class NewThemeService : INewThemeService
 
     public FrameworkElement GetShellRootContent()
     {
-        var window = GetThemeWindow();
+        return TryGetShellRootContent() ?? throw new Exception("No root content found");
-        if (window is IWinoShellWindow shellWindow)
-            return shellWindow.GetRootContent();
-
-        if (window?.Content is FrameworkElement frameworkElement)
-            return frameworkElement;
-
-        throw new Exception("No root content found");
     }
 
     private bool isInitialized = false;
@@ -680,10 +673,18 @@ public class NewThemeService : INewThemeService
         if (window == null)
             return null;
 
-        if (window is IWinoShellWindow shellWindow)
+        try
-            return shellWindow.GetRootContent();
+        {
+            if (window is IWinoShellWindow shellWindow)
+                return shellWindow.GetRootContent();
 
-        return window.Content as FrameworkElement;
+            return window.Content as FrameworkElement;
+        }
+        catch (Exception ex)
+        {
+            Debug.WriteLine($"Skipping root content lookup for closed window: {ex.Message}");
+            return null;
+        }
     }
 
     public async Task ApplyThemeToActiveWindowAsync()