Do check the latest iterations of some fixes for DateAndTime here
( http://bugs.squeak.org/view.php?id=474) , in particular this includes 
a fully tested implementation of the millisecond clock.

For testing you will need SUnit and SUnitGUI from 
http://www.squeaksource.com/Testing
Because it uses ClassClonerTestResource to clone the DataAndTime class 
for testing without messing with the main system clock.


from my last note:
> I am pleased to announce a testable/tested incarnation of the 
> millisecond clock implementation. It is much faster too. This handles 
> the clock rollover, and midnight rollovers.
>
> If the clock is not used for a number of days and may have lost 
> synchronisation then a sanity check is performed that will recalculate 
> the offsets.
The updates can be quite tricky to load, but I hope to see them in 3.10 
(Edgar?) It would be great if you could try them out and offer feedback 
first.

best regards

Keith
> Hi all,
>
> I am doing some stuff with dates and I noticed the date classes that 
> come with the default Squeak image are very nice and very close to 
> having everything I would want.  But there are a few inconsistencies 
> here and there, and things missing that would make things easier.
>
> So what is the procedure to updating this?  I think it's part of the 
> core system so I probably can't just do a monicello package update 
> somewhere?  Do I have to do it through mantis?
>
> Thanks,
> Jason