Equivalent of gettimeday() for Windows

Question

Does anyone know an equivalent function of the gettimeofday() function in Windows environment? I am comparing a code execution time in Linux vs Windows. I am us

Answer 1

Nowadys I would use the following for gettimeofday() on Windows, which is using GetSystemTimePreciseAsFileTime() if compiled for Windows 8 or higher and GetSystemTimeAsFileTime() otherwise:

#include 
struct timezone {
    int tz_minuteswest;
    int tz_dsttime;
};

int gettimeofday(struct timeval *tv, struct timezone *tz)
{
    if (tv) {
        FILETIME               filetime; /* 64-bit value representing the number of 100-nanosecond intervals since January 1, 1601 00:00 UTC */
        ULARGE_INTEGER         x;
        ULONGLONG              usec;
        static const ULONGLONG epoch_offset_us = 11644473600000000ULL; /* microseconds betweeen Jan 1,1601 and Jan 1,1970 */

#if _WIN32_WINNT >= _WIN32_WINNT_WIN8
        GetSystemTimePreciseAsFileTime(&filetime);
#else
        GetSystemTimeAsFileTime(&filetime);
#endif
        x.LowPart =  filetime.dwLowDateTime;
        x.HighPart = filetime.dwHighDateTime;
        usec = x.QuadPart / 10  -  epoch_offset_us;
        tv->tv_sec  = (time_t)(usec / 1000000ULL);
        tv->tv_usec = (long)(usec % 1000000ULL);
    }
    if (tz) {
        TIME_ZONE_INFORMATION timezone;
        GetTimeZoneInformation(&timezone);
        tz->tz_minuteswest = timezone.Bias;
        tz->tz_dsttime = 0;
    }
    return 0;
}