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[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int nMsg, int wParam, SYSTEMTIME dt);
[StructLayout(LayoutKind.Sequential)]
public class 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;
}
private const int DTM_SETSYSTEMTIME = 0x00001002;
private const int GDT_VALID = 0;
SYSTEMTIME dt = new SYSTEMTIME();
SendMessage(ptrHwnd, DTM_SETSYSTEMTIME, GDT_VALID, dt);