///调用API [DllImport("kernel32.dll", SetLastError = true)] public static extern int SetLocalTime(ref SystemTime lpSystemTime); /// 定义结构 public struct SystemTime { .... } /// 调用 SystemTime systNew = new SystemTime(); // 设置属性 systNew.wDay =short.Parse( DateTime.Now.Day.ToString()); //... // 调用API,更新系统时间 SetLocalTime(ref systNew); 完整的源代码下载:C#调用API修改系统时间