Avalonia/samples/ControlCatalog/Pages/CalendarDatePickerPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:vm="using:ControlCatalog.ViewModels"
             x:DataType="vm:MainWindowViewModel"
             x:Class="ControlCatalog.Pages.CalendarDatePickerPage">
  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Classes="h2">A control for selecting dates with a calendar drop-down</TextBlock>
        
    <StackPanel Orientation="Horizontal"
                Margin="0,16,0,0"
                HorizontalAlignment="Center"
                Spacing="16">
      <StackPanel Orientation="Vertical">
        <TextBlock Text="SelectedDateFormat: Short"/>
        <CalendarDatePicker Name="DatePicker1"
                    SelectedDateFormat="Short"
                    Margin="0,0,0,8"/>

        <TextBlock Text="SelectedDateFormat: Long"/>
        <CalendarDatePicker Name="DatePicker2"
                    SelectedDateFormat="Long"
                    Margin="0,0,0,8"/>

        <TextBlock Text="SelectedDateFormat: Custom"/>
        <CalendarDatePicker Name="DatePicker3"
                    SelectedDateFormat="Custom"
                    CustomDateFormatString="ddd, MMM d"
                    Margin="0,0,0,8"/>

        <TextBlock Text="Blackout Dates"/>
        <CalendarDatePicker Name="DatePicker4"
                    Margin="0,0,0,8"/>

        <CalendarDatePicker Margin="0,0,0,8"
                    Watermark="Watermark"/>
        <CalendarDatePicker Margin="0,0,0,8"
                    Name="DatePicker5"
                    Watermark="Floating Watermark"
                    UseFloatingWatermark="True"/>
                
        <TextBlock Text="Disabled"/>
        <CalendarDatePicker IsEnabled="False"/>
        
        <TextBlock Text="Validation Example"/>
        <CalendarDatePicker SelectedDate="{CompiledBinding ValidatedDateExample, Mode=TwoWay}"/>
      </StackPanel>

    </StackPanel> 
  </StackPanel>
</UserControl>