调用微软系统自带 kernel32.dll, 利用里面的  GetTimeZoneInformation(..) API 把本机的时间和时区调出, 系统本身也处理的欧美时区的冬令和夏令时间.

#import "kernel32.dll"
int  GetTimeZoneInformation( int& TZInfoArray[] );
#import

#define TIME_ZONE_ID_UNKNOWN   0
#define TIME_ZONE_ID_STANDARD  1
#define TIME_ZONE_ID_DAYLIGHT  2

int TZInfoArray[43];

datetime TimeGMTConversion()  //modified by euclid
{
  int ret = GetTimeZoneInformation( TZInfoArray );
  int bias = TZInfoArray[0];
  if ( ret == TIME_ZONE_ID_STANDARD ) bias += TZInfoArray[21];
  if ( ret == TIME_ZONE_ID_DAYLIGHT ) bias += TZInfoArray[42];
  return( TimeLocal() + bias * 60 );
}