Clock.Desktop/Views/MainWindow.xaml

<Window x:Class="Clock.Desktop.Views.MainWindow" x:ClassModifier="internal"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:viewModels="clr-namespace:Clock.ViewModels;assembly=Clock"
        xmlns:desktop="clr-namespace:Clock.Desktop">
    <Window.Resources>
        <desktop:DataProvider x:Key="ClockViewModel" ObjectType="{x:Type viewModels:IClockViewModel}" />
    </Window.Resources>
    <Grid DataContext="{StaticResource ClockViewModel}">
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
            <!-- ReSharper disable once Xaml.BindingWithContextNotResolved -->
            <TextBlock Text="{Binding Date}" FontSize="64" />
            <!-- ReSharper disable once Xaml.BindingWithContextNotResolved -->
            <TextBlock Text="{Binding Time}" FontSize="64" />
            <StackPanel.Effect>
                <DropShadowEffect Color="Black" Direction="20" ShadowDepth="5" Opacity="0.5"/>
            </StackPanel.Effect>
        </StackPanel>
    </Grid>
</Window>