On Tuesday 08 Nov 2011 01:48:30 Érico Porto wrote:
> When I was installing my system I typed the date and hour wrong , and
> didn't noticed, and as far my computer knows, today is tomorrow, two hours
> wrong...
> 
> I thought it was ok to change later, but actually, I can't. If I type the
> date command to change time, it changes ok, but when I boot, my system
> forgets it, and it's tomorrow again.. I've tried some ideas from the web,
> but nothing worked..
> 
> Is this a known bug?
> 
> Érico V. Porto

Consider setting the time in your BIOS.

Alternatively, read man hwclock and set it with that.
-- 
Regards,
Mick