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month=`date +%m`
year=`date +%Y`
lmonth=`expr $month - 1`
if test "$lmonth" = "0"
then
lmonth=12
year=`expr $year - 1`
fi

L_date=$lmonth"_"$year

mv Amount.zip Amount_$L_Date.zip


...

I Believe you can do this by touch command

touch newfile #will change modification time to current date and time
touch -t 8001031305 oldfile #sets the modification time of oldfile...