##Date logic *sobs*

function date_logic {

#a not so elegant, elegant solution to the issue of month rollover.
day_tmp=`date +"%d"`
month_tmp=`date +"%m"`
if [ $day_tmp -eq 01 ]
then
	if [ $month_tmp -eq 01 ] || [ $month_tmp -eq 02 ] || [ $month_tmp -eq 04 ] || [ $month_tmp -eq 06 ] || [ $month_tmp -eq 08 ] || [ $month_tmp -eq 09 ] || [ $month_tmp -eq 11 ] 
	then
	day=31
	elif [ $month_tmp -eq 03 ]
	then
	day=28
	elif [ $month_tmp -eq 05 ] || [ $month_tmp -eq 07 ] || [ $month_tmp -eq 10 ] || [ $month_tmp -eq 12 ]
	then
	day=30
	fi
else
	day=$(( $day_tmp - 1 ))
fi

}