Bash script that loops over dates for other atomic scripts

date_looper.sh

#!/bin/bash
# On linux use date, on mac gdate [via `brew install coreutils`].
# Will run from oldest date to today.
# $ sh date_looper.sh '2016-12-10'
currentdate=$1
loopenddate=$(gdate --date "$2 1 day" +%Y-%m-%d)

until [ "$currentdate" == "$loopenddate" ]
do
  echo $currentdate
  # SOME_COMMAND_THAT_ACCEPTS_A_DAY $currentdate
  
  # update current date to next day
  currentdate=$(gdate --date "$currentdate 1 day" +%Y-%m-%d)
done