시스템 날짜 변경하기

C#

by xarfox 2013. 6. 27. 14:55

using System;
using System.Runtime.InteropServices;

    namespace SystemDateTime
    {
        class Class1
        {    /// <summary> This structure represents a date and time. </summary>
            public struct SYSTEMTIME 
            {    public ushort wYear,wMonth,wDayOfWeek,wDay,
                    wHour,wMinute,wSecond,wMilliseconds;
            }

            /// <summary>
            /// This function retrieves the current system date
            /// and time expressed in Coordinated Universal Time (UTC).
            /// </summary>
            /// <param name="lpSystemTime">[out] Pointer to a SYSTEMTIME structure to
            /// receive the current system date and time.</param>
            [DllImport("kernel32.dll")]
            public extern static void GetSystemTime(ref SYSTEMTIME lpSystemTime);

            /// <summary>
            /// This function sets the current system date
            /// and time expressed in Coordinated Universal Time (UTC).
            /// </summary>
            /// <param name="lpSystemTime">[in] Pointer to a SYSTEMTIME structure that
            /// contains the current system date and time.</param>
            [DllImport("kernel32.dll")]
            public extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);

            static void Main()
            {    Console.WriteLine(DateTime.Now.ToString());
                SYSTEMTIME st = new SYSTEMTIME();
                GetSystemTime(ref st);
                Console.WriteLine("Adding 1 hour...");
                st.wHour = (ushort)(st.wHour + 1 % 24);
                if (SetSystemTime(ref st) == 0)
                    Console.WriteLine("FAILURE: SetSystemTime failed");
                Console.WriteLine(DateTime.Now.ToString());
                //Console.WriteLine("Setting time back...");
                //st.wHour = (ushort)(st.wHour - 1 % 24);
                //SetSystemTime(ref st);
                //Console.WriteLine(DateTime.Now.ToString());
                //Console.WriteLine("Press Enter to exit");
                //Console.Read();
            }
        }
    }