there's one serious issue with your script: When the month is december or january, it wil display the wrong year, since you only calculate it once. If it's december, you have to call only the next month with "year + 1", and if it's january, you have to call only the previous month with "year - 1" Here's the fix:

#!/bin/zsh

month=`date +%m`
year=`date +%Y`

nextMonth=$(($month+1))
lastMonth=$(($month-1))

if [[ $month -eq 1 ]]
then
        lastMonth=12
        cal $lastMonth $(($year-1)) | awk '{ print $0; while (getline != 0 ) { print " "$0 }}'
else
        cal $lastMonth $year | awk '{ print $0; while (getline != 0 ) { print " "$0 }}'
fi

cal | awk -v cday=`date "+%d"` '{ fill=(int(cday)>9?"":" "); print " "$0; getline; print " "$0; while (getline != 0) {a=" "$0" "; sub(" "fill int(cday)" ",fill "(" int(cday)")", a); print a }}'

if [[ $month -eq 12 ]]
then
        nextMonth=1
        cal $nextMonth $(($year+1)) | awk '{ print $0; while (getline != 0 ) { print " "$0 }}'
else
        cal $nextMonth $year | awk '{ print $0; while (getline != 0 ) { print " "$0 }}'
fi

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