gettimeofday.c

#ifdef _MSC_VER
#include <stdint.h>
#include <winsock2.h>

// https://stackoverflow.com/a/26085827/16079666
int gettimeofday(struct timeval *tp, struct timezone *tzp)
{
    // Note: some broken versions only have 8 trailing zero's, the correct
    // epoch has 9 trailing zero's This magic number is the number of 100
    // nanosecond intervals since January 1, 1601 (UTC) until 00:00:00 January
    // 1, 1970
    static const uint64_t EPOCH = ((uint64_t) 116444736000000000ULL);

    SYSTEMTIME system_time;
    FILETIME file_time;
    uint64_t time;

    GetSystemTime(&system_time);
    SystemTimeToFileTime(&system_time, &file_time);
    time = ((uint64_t) file_time.dwLowDateTime);
    time += ((uint64_t) file_time.dwHighDateTime) << 32;

    tp->tv_sec = (long)((time - EPOCH) / 10000000L);
    tp->tv_usec = (long)(system_time.wMilliseconds * 1000);

    return 0;
}
#endif