ConvertNullDate extension method

Question

What wrong this class? I try to reach extension method but cant

namespace BO
{   
 public static class Helper
    {
        public static DateTime? ConvertNullDate(this DateTime date)
        {
            return date != DateTime.MinValue ? date : (DateTime?)null;
        }
    }
}

If not possible, whats the solution should be

Answer 1

if your input is DateTime? then you don't need to convert it DateTime?!

so i think you want something like below

public static DateTime? ConvertNullDate(this DateTime date)
{
    return date != DateTime.MinValue ? date : (DateTime?)null;
}