gettimeofday function for windows

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The gettimeofday() function obtains the current time, expressed as seconds and microseconds since the Epoch, and store it in the timeval structure pointed to by tv. As posix says gettimeoday should return zero and should not reserve any value for error, this function returns zero. Here is the program, I?ve given definition struct timezeone and for others I didn?t give as all other data types definitions are available in windows include files itself.

#include < time.h >

#if defined(_MSC_VER) || defined(_MSC_EXTENSIONS)
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
#else
  #define DELTA_EPOCH_IN_MICROSECS  11644473600000000ULL
#endif

struct timezone
{
  int  tz_minuteswest; /* minutes W of Greenwich */
  int  tz_dsttime;     /* type of dst correction */
};

int gettimeofday(struct timeval *tv, struct timezone *tz)
{
  FILETIME ft;
  unsigned __int64 tmpres = 0;
  static int tzflag;

  if (NULL != tv)
  {
    GetSystemTimeAsFileTime(&ft);

    tmpres |= ft.dwHighDateTime;
    tmpres <<= 32;
    tmpres |= ft.dwLowDateTime;

    /*converting file time to unix epoch*/
    tmpres /= 10;  /*convert into microseconds*/
    tmpres -= DELTA_EPOCH_IN_MICROSECS;
    tv->tv_sec = (long)(tmpres / 1000000UL);
    tv->tv_usec = (long)(tmpres % 1000000UL);
  }

  if (NULL != tz)
  {
    if (!tzflag)
    {
      _tzset();
      tzflag++;
    }
    tz->tz_minuteswest = _timezone / 60;
    tz->tz_dsttime = _daylight;
  }

  return 0;
}

usage:

struct timeval now; struct timezone tzone;

gettimeofday(&now, NULL);

gettimeofday(&now, &tzone);

download [gettimeofday.c] program..

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c/c++ blogging - January 10, 2007 says:

January 6, 2007 at 6:51 pm

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Displaying execution time of a program says:

April 15, 2007 at 6:27 pm

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Anuj Verma says:

December 29, 2007 at 4:35 pm

very useful post, saved me a lot of time, I’d searched the net could not find a working program, at last found here, and without tweaking a bit it worked straight away, thanks
koos dering says:

January 11, 2008 at 1:06 pm

one would think conversion to usecs goes before adjusting by DELTA_EPOCH_IN_MICROSECS (really in microsecs- 8 zeroes 6 from micro, 2 from 60*60*24 -whole day)
ponnada says:

January 11, 2008 at 6:28 pm

Thanks for pointing this out, I’d corrected the code
schmendrick says:

June 23, 2008 at 2:30 pm

great article!

thanks, this saved me some time!
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December 18, 2008 at 4:02 pm

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Rich says:

October 28, 2009 at 5:56 pm

Hey, many thanks, this was exactly what I needed at 3am to get my unix
app working under Win32. Many MANY thanks!

Rich
Omf says:

January 4, 2010 at 5:29 am

Very, very useful.
Abe says:

March 9, 2010 at 3:07 pm

Thnky you, for an excellent post