A quick shell script to generate ranges of dates

dates.sh

#!/bin/bash

LIMIT=${1:-1}
FORMAT=${2:-"%Y-%m-%d"}

if [[ $LIMIT -lt 0 ]]
then
    SEQ=$(seq 0 -1 $(( $LIMIT + 1 )))
else
    SEQ=$(seq 0 $(( $LIMIT - 1 )))
fi

for i in $SEQ
do
    date -d "+$i days" +$FORMAT
done