Meaning of exception in C# app: “Not a legal OleAut date”?

Question

Does anyone know what this means. Getting this in C# winforms applications:

Not a legal OleAut date

Answer 1

I've used:

try
{
    if (folderItem.ModifyDate.Year != 1899)
    {
        this.FileModifiedDate = folderItem.ModifyDate.ToShortDateString() + 
            " " +
            folderItem.ModifyDate.ToLongTimeString();
    }
}
//we need this because it throws an exception if it's an invalid date...
catch (ArgumentException) { } 

to deal with the same problem I'm having. It throws the exception when we check the year in my case. Doing nothing on an invalid date is exactly the behavior I want, so this hack works.