修改系统时间

//imports SetLocalTime function from kernel32.dll 
[DllImport("kernel32.dll", SetLastError=true)] 
public static extern int SetLocalTime (ref SystemTime lpSystemTime); 

//struct for date/time apis 
public struct SystemTime 
{ 
public short wYear; 
public short wMonth; 
public short wDayOfWeek; 
public short wDay; 
public short wHour; 
public short wMinute; 
public short wSecond; 
public short wMilliseconds; 
} 

// And then set up a structure with the required properties and call the api from code: 

SystemTime systNew = new SystemTime(); 

// 设置属性 
systNew.wDay = 1; 
systNew.wMonth = 1; 
systNew.wYear = 2004; 
systNew.wHour = 9; 
systNew.wMinute = 0; 
systNew.wSecond = 0; 

// 调用API，更新系统时间 
SetLocalTime(ref systNew);