GNU bug report logs - #5823
run-at-time and Setting system time

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From: david <at> adboyd.com (J. David Boyd)
To: 5823 <at> debbugs.gnu.org
Cc: help-gnu-emacs <at> gnu.org
Subject: bug#5823: run-at-time and Setting system time
Date: Fri, 02 Apr 2010 13:36:51 -0400

chandan <chandan.babu <at> globaledgesoft.com> writes:

> 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


It sounds like a good thing to me.

Say the time is 13:00, and you do what you said.  You told the machine
to give an invocation at 13:01.  

If you move the clock ahead, the code _should_ run, as it is now past
13:01.

Dave

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