namespace pop
{
    using IComparable = System.IComparable;
    using Object      = System.Object;
    using String      = System.String;
    public interface Date: IComparable
    {
        int    Year  { get; set; }
        int    Month { get; set; }
        int    Day   { get; set; }
        bool   Equals(Object pObject);
        int    GetHashCode();
        String ToString();
    }
}