bash date arithmetic

date_arithmetic

#!/bin/bash
set -eEu
set -o pipefail

do_something() {
    some_date=$1
    echo "$some_date"
}

# https://stackoverflow.com/a/25701358
# (requires gnu date)
d="2014-06-29"
until [[ $d > 2014-07-03 ]]; do
    do_something($d)
    d=$(date -I -d "$d + 1 day")
done