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      1 #pragma once
      2 
      3 //http://social.msdn.microsoft.com/Forums/en/vcgeneral/thread/430449b3-f6dd-4e18-84de-eebd26a8d668
      4 
      5 #include <time.h>
      6 #include <winsock2.h>
      7 
      8 #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
      9   #define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
     10 #else
     11   #define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
     12 #endif
     13 
     14 struct timespec {
     15 
     16 time_t tv_sec; /* Seconds since 00:00:00 GMT, */
     17 
     18 /* 1 January 1970 */
     19 
     20 long tv_nsec; /* Additional nanoseconds since */
     21 
     22 /* tv_sec */
     23 
     24 };
     25 
     26 struct timezone
     27 {
     28   int  tz_minuteswest; /* minutes W of Greenwich */
     29   int  tz_dsttime;     /* type of dst correction */
     30 };
     31 
     32 static __inline int gettimeofday(struct timeval *tv, struct timezone *tz)
     33 {
     34   FILETIME ft;
     35   unsigned __int64 tmpres = 0;
     36   static int tzflag;
     37 
     38   if (NULL != tv)
     39   {
     40     GetSystemTimeAsFileTime(&ft);
     41 
     42     tmpres |= ft.dwHighDateTime;
     43     tmpres <<= 32;
     44     tmpres |= ft.dwLowDateTime;
     45 
     46     /*converting file time to unix epoch*/
     47     tmpres -= DELTA_EPOCH_IN_MICROSECS;
     48     tv->tv_sec = (long)(tmpres / 1000000UL);
     49     tv->tv_usec = (long)(tmpres % 1000000UL);
     50   }
     51 
     52   if (NULL != tz)
     53   {
     54     if (!tzflag)
     55     {
     56       _tzset();
     57       tzflag++;
     58     }
     59     tz->tz_minuteswest = _timezone / 60;
     60     tz->tz_dsttime = _daylight;
     61   }
     62 
     63   return 0;
     64 }