static extern bool SetSystemTime(ref SYSTEMTIME time);

Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean

Fill-in an instance of the SYSTEMTIME struct and call SetSystemTime(ref obj), where obj is the instance of your struct.

        public extern static uint SetSystemTime(ref SYSTEMTIME lpSystemTime);

            if (SetSystemTime(ref st) == 0)

                Console.WriteLine("FAILURE: SetSystemTime failed");

            SetSystemTime(ref st);

To set the date and time without consideration to the locale settings use SetSystemTime.

static void SetSystemTime(System.DateTime dt)

To see sample code for VB, please go to SetSystemTime.

   static extern bool SetSystemTime(ref SYSTEMTIME time);

   Private Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean

    Private Shared Function SetSystemTime(ByRef time As SYSTEMTIME) As Boolean

    SetSystemTime(s)

     private static extern bool SetSystemTime(ref SYSTEMTIME time);

     SetSystemTime(ref s);

    dt = dt.ToUniversalTime();  // SetSystemTime expects the SYSTEMTIME in UTC