print all dates string between startdate and enddate in mac os

date.sh

#!/bin/bash

startdate=$1
enddate=$2

function print_formatted() {
    res=`date -j -f %Y-%m-%d $1 +%Y-%m-%d`
    echo $res

}

startfmt=$(print_formatted $startdate)
endfmt=$(print_formatted $enddate)

let j=0
while [ "$loop_date" != "$endfmt" ]; do
    loop_date=`date -j -v+${j}d -f %Y-%m-%d "$startfmt" +%Y-%m-%d`
    echo $loop_date
    let j=j+1
done

# ./date.sh 20191231 20200105
#2019-12-31
#2020-01-01
#2020-01-02
#2020-01-03
#2020-01-04
#2020-01-05