How to store date only value from CalendarDatePicker to SQLite database in Windows 10 universal app

In my Windows 10 universal app i use the CalendarDatePicker to select a date:

<CalendarDatePicker x:Name="cdpStartDate" Width="150" />

In Code behind i use the following code to store the date to a SQLite database:

booking = new Bookings();
using (
     SQLite.Net.SQLiteConnection conn =
        new SQLite.Net.SQLiteConnection(new SQLite.Net.Platform.WinRT.SQLitePlatformWinRT(), Common.Utils.DbPath()))
        {
        booking.StartDate = cdpStartDate.Date.ToDateTime();
        conn.Update(booking);
        }

My table class looks like this:

[Table("Bookings")]
public class Bookings
{
    [PrimaryKey]
    public int BookingId { get; set; }

    [NotNull]
    public DateTime StartDate { get; set; }
}

While debugging the value for booking.StartDate is 18.11.2015 00:00:00. But after saving the value to the SQLite database the value is converted to 17.11.2015 23:00:00. This seems to be Utc time. I do not need any time information in my app, just the Date only.

How can i save the date without conversion to my database?

Thanks, Uwe