Adding one date to now problem

Hi
I want my application read a file which name will be next day. For example, if today is 20040107 my application will need to read a file called 20040108.
After reading manuals I did:
Calendar now = Calendar.getInstance();
now.roll(Calendar.DATE,1);to get what I want, but thinking that this method is smart and if we are at 20041231 when I add a day it will return 20050101..... but no, this method is not so intelligent... :)
How could I do this. Should I do it by hand or could somebody recommend me another method to avoid invent the wheel ?
thanks in advance
Javier

Try Calendar.add() instead
http://java.sun.com/j2se/1.5.0/docs/api/java/util/Calendar.html#add(int,%20int)

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