@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Sets the current system time and date. The system time is expressed in Coordinated Universal Time (UTC). !!!!C# Signature: [DllImport("kernel32.dll")] static extern bool SetSystemTime(ref SYSTEMTIME time); !!!!VB Signature: <DllImport("kernel32.dll")> _ Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean End Function !!!!User-Defined Types: [SYSTEMTIME] !!!!Notes: Fill-in an instance of the [SYSTEMTIME] struct and call SetSystemTime(ref obj), where obj is the instance of your struct. !!!!Tips & Tricks: Please add some! !!!!Sample Code: 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(); } } } Documentation: SetSystemTime@msdn on MSDN
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