We help IT Professionals succeed at work.

time_t / difftime in millisconds

kph1 asked
Medium Priority
Last Modified: 2006-11-17
Does anyone have a function in ANSI C that breaks down the time_t and difftime functions into milliseconds instead of seconds? I am running it on a dos platform based machine.
Watch Question

time_t cannot be broken down into milliseconds.  It is a integer count of seconds, and does not have a resolution smaller than seconds.  What operating system are you using?


Edited text of question
rmichels is right. All you can do (I'm talking portability here)
is to give the clock(void) function a try. This function
returns a clock_t value. The <time.h> file defines a manifest
constant CLOCKS_PER_SEC, i.e. every other second, clock()
returns a new value CLOCKS_PER_SEC units higher than the
previous one ...

kind regards,

Jos aka jos@and.nl

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts

If you were under WIn95 or WinNT you could use timeGetTime (part of the multimedia API) which is down to milliseconds.

I think functions that do better than that are dependant on the hardware etc.

Also have a look at the C FAQ questions:

19.37:  How can I implement a delay, or time a user's response, with sub-second resolution?

You can use the function ftime.

#include <sys/time.h>

int ftime(
          struct timeb *tp );

The struct timeb contains a field millitm with the milliseconds.

Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.