bug report: picoseconds handling in System.Time

[Simon Marlow]

Andrei Paskevich wrote:
> The diffClockTimes function can generate TimeDiff's with 
> a negative value of tdPicosec. When you pass such a TimeDiff 
> to addToClockTime, the latter may send negative picoseconds 
> to toClockTime, provoking the error "picoseconds out of range".
> 
> While we are at it, please, teach normalizeTimeDiff to normalize
> tdPicoSeconds, too. This misfeature hangs around for too long :)
> 
> Best regards,
> Andrei
> 
> P.S. I'm not subscribed to the list, so please cc: me if needed.

There are a number of serious problems with System.Time.  If you're doing 
calculations involving time periods, I strongly suggest moving to the new 
time package (Data.Time etc.).

Cheers,
	Simon