How to make a calculation in DOS?

[Moon2006]

HI,

Again, I am trying to make a calculation in the bat file.

I would like to get the last year as 2005 by substracting from this year 2006.
Can I do that?May I know how to do ?
Neither  %year%-1  nor %year-1% doesn't work.
Value of %year% is 2006.
Any idea pls?

Thanks,

[ghostdog74]

you can look at the set command here http://www.ss64.com/nt/set.html

[Moon2006]

I got it.
Thanks so  much............

 

you can look at the set command here http://www.ss64.com/nt/set.html