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I had the same issue and I tried some of the above answers, maybe they are ok, but none of those answers fixed on what I was trying to do it, using macOS. I was trying to iterate over dates in the past.

I am using macOS, and the following is what worked for me:

#!/bin/bash

# Get the machine date
newDate=$(date '+%m-%d-%y')

# Set a counter variable
counter=1

# Increase the counter to get back in time
while [ "$newDate" != 06-01-18 ]; do
  echo $newDate
  newDate=$(date -v -${counter}d '+%m-%d-%y')
  counter=$((counter + 1))
done

Hope it helps.Â