time.h - How can i get UTCTime in millisecond since January 1, 1970 in c language

Question

Is there any way to get milliseconds and its fraction part from 1970 using time.h in c language?

Answer 1

This works on Ubuntu Linux:

#include <sys/time.h>

...

struct timeval tv;

gettimeofday(&tv, NULL);

unsigned long long millisecondsSinceEpoch =
    (unsigned long long)(tv.tv_sec) * 1000 +
    (unsigned long long)(tv.tv_usec) / 1000;

printf("%llu
", millisecondsSinceEpoch);

At the time of this writing, the printf() above is giving me 1338850197035. You can do a sanity check at the TimestampConvert.com website where you can enter the value to get back the equivalent human-readable time (albeit without millisecond precision).