Date Changing problem

Hi
I'm totally new to excel. I dont ever use it but i have to to use it this time to make a sheet for my boss that shows the days from 1/1/05 to current with numbers in the next column showing sewer outputs from lift stations.

Well, I made a column of dates from 1/1/05 to 12/31/05. Each date in its own cell. What i'd like to do is copy all of those cells and paste them, but have the year change to 06 so i dont have to manually go back and do them.

is this possible, and if so, can you give a newb answer for me? Thanks!!!

Oh, and we have office excel version 2003 :P

Hi,
type 365 in an empty cell
Copy it
select the range with dates from 2005
Right click
Select Paste special
Check " add"
OK