Avalonia/samples/ControlCatalog/Pages/CalendarPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Orientation="Vertical" Spacing="4">
    <TextBlock Classes="h1">Calendar</TextBlock>
    <TextBlock Classes="h2">A calendar control for selecting dates</TextBlock>
        
    <StackPanel Orientation="Horizontal"
                Margin="0,16,0,0"
                HorizontalAlignment="Center"
                Spacing="16">
      <StackPanel Orientation="Vertical">
        <TextBlock Text="SelectionMode: None"/>
        <Calendar SelectionMode="None"
                  Margin="0,0,0,8"/>

        <TextBlock Text="SelectionMode: SingleDate"/>
        <Calendar SelectionMode="SingleDate"
                  Margin="0,0,0,8"/>

        <TextBlock Text="Disabled"/>
        <Calendar IsEnabled="False"
                  SelectionMode="SingleDate"/>
      </StackPanel>

      <StackPanel Orientation="Vertical">
        <TextBlock Text="SelectionMode: SingleRange"/>
        <Calendar SelectionMode="SingleRange"
                  Margin="0,0,0,8"/>

        <TextBlock Text="SelectionMode: MultipleRange"/>
        <Calendar SelectionMode="MultipleRange"/>
      </StackPanel>

      <StackPanel Orientation="Vertical">
        <TextBlock Text="DisplayDates"/>
        <Calendar Name="DisplayDatesCalendar"
                  SelectionMode="SingleDate"
                  Margin="0,0,0,8"/>

        <TextBlock Text="BlackoutDates"/>
        <Calendar Name="BlackoutDatesCalendar"
                  SelectionMode="SingleDate" />
      </StackPanel>
      
    </StackPanel> 
  </StackPanel>
</UserControl>