Help with manipulating environmental variables in UNIX

I am wondering if there is away to increment a date in c shell. What I need to do is basic, but I lack the knowledge.

I have they following environmental variable in my job scripts

setenv YYYY `date '+%Y'`

I then set YYYY to be part of my output dataset name:

setenv dd_OUTPUTP "build$YYYY.dat"

So when I run the job script, it creates a dataset named build2012.dat.

I need to have the dataset be build2013.dat.

Is there a way to increment $YYYY by 1 to give me the next year.

Thanks.

try:

@ YYYY++