Hi All,
I am using the below code to get the year and month from date:
Below gives output like 201212.

dt=`date '+%Y%m'`

dt=201211

date -d'-1 month' '+%Y%m'
201211

uname
Linux
echo $SHELL
/bin/bash

Search on "datecalc" in this forum.

If you are on a system where date doesn't have a -d option, the following will work in any POSIX conforming shell:

#!/bin/ksh
dt=$(date +%Y%m)
dt=$((dt - 1))
if [ ${dt#????} -eq 0 ]
then    dt=$((${dt%??} - 1))12
fi
printf "dt has been set to %s\n" $dt