docs-desktop/dotnet-desktop-guide/net/wpf/data/snippets/data-binding-overview/csharp/DateConverter.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Globalization;
using System.Windows.Data;

namespace bindings
{
    [ValueConversion(typeof(DateTime), typeof(string))]
    public class DateConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            DateTime date = (DateTime)value;
            return date.ToShortDateString();
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string strValue = value.ToString();
            DateTime resultDateTime;
            if (DateTime.TryParse(strValue, out resultDateTime))
            {
                return resultDateTime;
            }
            return value;
        }
    }
}