#!/bin/sh

DATE=`date -d "June 3" +%j`
TODAY=`date +%j`
DAYS=$(($DATE - $TODAY))

case $DAYS in
  0) echo "It's today! Merry Christmas!";;
  [0-9]*) echo "$DAYS days remaining";;
  -[0-9]*) echo "Oops, you missed it";;
esac