DosDateTime.cs

using System;
 
namespace Waher.Content.Zip
{
    public static class DosDateTime
    {
        public static ushort ToDosTime(this DateTime Timestamp)
        {
            int Hour = Timestamp.Hour;
            int Minute = Timestamp.Minute;
            int Second = Timestamp.Second / 2;
 
            return (ushort)((Hour << 11) | (Minute << 5) | Second);
        }
 
        public static ushort ToDosDate(this DateTime Timestamp)
        {
            int Year = Timestamp.Year < 1980 ? 0 : Timestamp.Year - 1980;
            int Month = Timestamp.Month;
            int Day = Timestamp.Day;
 
            return (ushort)((Year << 9) | (Month << 5) | Day);
        }
    }
}