prs/prs.desktop/DockPanels/DateHasValueConverter.cs

using System;
using System.Globalization;
using System.Windows.Data;

namespace PRSDesktop
{
    [ValueConversion(typeof(DateTime), typeof(bool))]
    public class DateHasValueConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var dateTime = (DateTime)value;
            return !dateTime.Equals(DateTime.MinValue);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}