Display time in milliseconds in C++/C linux /unix

you would use the gettimeofday function:

struct timeval  tv = { 0 };
gettimeofday(&tv, NULL);

double mill = (tv.tv_usec) / 1000 ; 

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Sara

The problem I have seen is how to printf the value, I'm seeing weird values
267.0000
948.0000

then
15.0000


etc ...
I'm expecting that time of day will be increasing

For both system calls? The man page to gettimeofday (http://linux.die.net/man/2/gettimeofday) states:

POSIX.1-2008 marks gettimeofday() as obsolete, recommending the use of clock_gettime(2) instead. [...] The time returned by gettimeofday() is affected by discontinuous jumps in the system time (e.g., if the system administrator manually changes the system time). If you need a monotonically increasing clock, see clock_gettime(2).

(even though I wouldn't expect such a weird behaviour)