kelvio, for your case, you shall check it when they hand over the driving license to you.
procedure is,
if your driving license expired at 30 Nov, 06. (01/12/05 - 30/11/06),
if you renew for a year, the new validity period shall be (01/12/06 - 30/11/07),
expiry date = "from date" + "year of validity" - 1 day
the problem is JPJ system and POS office system (if you renew at POS office), the system accept any date, even if the date overlaps (by right it shouldn't). They don't do checking, No user input control.
I was questioned by the officer because my old license validity period is (27/01/2000 - 27/01/2002), they though I carry fake driving license.... *speechless*