[DllImport("kernel32.dll", EntryPoint = "GetSystemDefaultLCID")]         public static extern int GetSystemDefaultLCID();         [DllImport("kernel32.dll", EntryPoint = "SetLocaleInfoA")]         public static extern int SetLocaleInfo(int Locale, int LCType, string lpLCData);         public const int LOCALE_SLONGDATE = 0x20;         public const int LOCALE_SSHORTDATE = 0x1F;         public const int LOCALE_STIME = 0x1003;         public void SetDateTimeFormat()         {             try             {                 int x = GetSystemDefaultLCID();                 SetLocaleInfo(x, LOCALE_STIME, "HH:mm:ss");        //时间格式                  SetLocaleInfo(x, LOCALE_SSHORTDATE, "yyyy-MM-dd");   //短日期格式                    SetLocaleInfo(x, LOCALE_SLONGDATE, "yyyy-MM-dd");   //长日期格式               }             catch (Exception ex)             {                 Console.WriteLine(ex);             }         }