bug#5822: run-at-time and Setting system time

[chandan]

Hi,
   Consider the following code:

(defun mwnn-timer-callback ()
 (message "Hi, inside mwnn-timer-callback"))

(run-at-time "60" nil 'mwnn-timer-callback)

The above code is supposed to cause mwnn-timer-callback to get invoked 
after 60 seconds. But if the system time is changed to a future date 
(say 20 seconds after the timer is started) the timer fires immediately.

Is this is a bug in the emacs code. If yes, can this be rectified?

Regards,
mwnn