How can I get the current time in milliseconds using C?

Question

How might I get the current time in milliseconds in C? I am doing following to get the time in seconds:

struct tm ptm;

now = time(NULL);

localtime_r(&now,ptm);

myTime= (ptm->tm_hour * 3600) + (ptm->tm_min * 60) + (ptm->tm_sec);

Looking at time.h, struct tm does not have the millisecond member in it.

See also http://stackoverflow.com/questions/361363/how-to-measure-time-in-milliseconds-using-ansi-c http://stackoverflow.com/questions/173409/how-can-i-find-the-execution-time-of-a-section-of-my-program-in-c — John Carter, Sep 02 '09 at 22:05

score 5 · Accepted Answer · answered Sep 02 '09 at 21:17

5

On Unix, use gettimeofday() to get the answer in microseconds and scale to milliseconds.
Or use POSIX clock_gettime() to get the answer in nanoseconds and scale to milliseconds.

answered Sep 02 '09 at 21:17

Jonathan Leffler

score 0 · Answer 2 · answered Mar 04 '10 at 18:41

0

I use ftime for time tracking (link text)

answered Mar 04 '10 at 18:41

Luca

2 Answers2