C#實現設置系統時間

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Demo
{
    public partial class 設置系統時間 : Form
    {
        public 設置系統時間()
        {
            InitializeComponent();
        }

        private void btnSetting_Click(object sender, EventArgs e)
        {
            //取得當前系統時間
            DateTime t = DateTime.Now;
            //在當前時間上加上一周
            t = t.AddDays(7);

            t = DateTime.Parse(this.dtpTime.Text);

            //轉換System.DateTime到SYSTEMTIME
            SYSTEMTIME st = new SYSTEMTIME();
            st.FromDateTime(t);


            //調用Win32 API設置系統時間
            Win32API.SetLocalTime(ref st);
            //顯示當前時間
           // MessageBox.Show(DateTime.Now.ToString());

        }
    }

    /// <summary>
    /// 
    /// </summary>
    public struct SYSTEMTIME
    {
        public ushort wYear;
        public ushort wMonth;
        public ushort wDayOfWeek;
        public ushort wDay;
        public ushort wHour;
        public ushort wMinute;
        public ushort wSecond;
        public ushort wMilliseconds;

        /// <summary>
        /// 從System.DateTime轉換。
        /// </summary>
        /// <param name="time">System.DateTime類型的時間。</param>
        public void FromDateTime(DateTime time)
        {
            wYear = (ushort)time.Year;
            wMonth = (ushort)time.Month;
            wDayOfWeek = (ushort)time.DayOfWeek;
            wDay = (ushort)time.Day;
            wHour = (ushort)time.Hour;
            wMinute = (ushort)time.Minute;
            wSecond = (ushort)time.Second;
            wMilliseconds = (ushort)time.Millisecond;
        }
        /// <summary>
        /// 轉換為System.DateTime類型。
        /// </summary>
        /// <returns></returns>
        public DateTime ToDateTime()
        {
            return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond, wMilliseconds);
        }
        /// <summary>
        /// 靜態方法。轉換為System.DateTime類型。
        /// </summary>
        /// <param name="time">SYSTEMTIME類型的時間。</param>
        /// <returns></returns>
        public static DateTime ToDateTime(SYSTEMTIME time)
        {
            return time.ToDateTime();
        }
    }
    public class Win32API
    {
        [DllImport("Kernel32.dll")]
        public static extern bool SetLocalTime(ref SYSTEMTIME Time);
        [DllImport("Kernel32.dll")]
        public static extern void GetLocalTime(ref SYSTEMTIME Time);
    }

}