UWP - Format DatePicker selected date

MainPage.xaml

<Page
    x:Class="UniversalAppTutorials.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UniversalAppTutorials"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <StackPanel 
        x:Name="stack_panel1" 
        Orientation="Vertical"
        Background="Snow"
        Padding="50"
        >
        <DatePicker
            x:Name="DatePicker1"
            DateChanged="DatePicker1_DateChanged"
            Header="Select A Date"
            />
        <TextBlock
            x:Name="TextBlock1"
            Foreground="Navy"
            FontSize="21"
            TextWrapping="Wrap"
            Margin="20"
            />
    </StackPanel>
</Page>
MainPage.xaml.cs

using System.Globalization;
using Windows.UI.Xaml.Controls;


namespace UniversalAppTutorials
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private void DatePicker1_DateChanged(object sender, DatePickerValueChangedEventArgs e)
        {
            // Get the instance of DatePicker object
            DatePicker datePicker = sender as DatePicker;

            // When date change
            TextBlock1.Text = "You selected:";

            // Get the DatePicker selected date
            TextBlock1.Text += "\n" + datePicker.Date;

            // Format DatePicker selected date using ToString method.
            TextBlock1.Text += "\nShort date: " + datePicker.Date.ToString("d");
            TextBlock1.Text += "\nLong date: " + datePicker.Date.ToString("D");
            TextBlock1.Text += "\nFull date and short time: " + datePicker.Date.ToString("f");
            TextBlock1.Text += "\nFull date and long time: " + datePicker.Date.ToString("F");
            TextBlock1.Text += "\nGeneral date time (short time): " + datePicker.Date.ToString("g");
            TextBlock1.Text += "\nGeneral date time (long time): " + datePicker.Date.ToString("G");
            TextBlock1.Text += "\nMonth pattern: " + datePicker.Date.ToString("M");
            TextBlock1.Text += "\nYear pattern: " + datePicker.Date.ToString("Y");

            // This line create a culture for english in us
            CultureInfo usCulture = new CultureInfo("en-US");

            // Create more culture
            CultureInfo frCulture = new CultureInfo("fr-FR");
            CultureInfo gbCulture = new CultureInfo("en-GB");
            CultureInfo dkCulture = new CultureInfo("da-DK");

            // String format date using string.format method
            TextBlock1.Text += "\n\nDate time format in [en-US] culture: " 
                + string.Format(usCulture, "{0:d}", datePicker.Date);

            TextBlock1.Text += "\nDate time format in [fr-FR] culture: " 
                + string.Format(frCulture, "{0:d}", datePicker.Date);

            TextBlock1.Text += "\nDate time format in [en-GB] culture: " 
                + string.Format(gbCulture, "{0:d}", datePicker.Date);

            TextBlock1.Text += "\nDate time format in [da-DK] culture: " 
                + string.Format(dkCulture, "{0:d}", datePicker.Date);
        }
    }
}
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