Palindrome dates since year 1001 - dd-mm-yyyy format

palindrome_dates.sh

#!/bin/bash
  
y="1001"

for i in $(seq 1001 2153); do
        y="$i"
        m=$(echo "${y:0:2}" | rev)
        d=$(echo "${y:2:2}" | rev)
        rv=$(echo "$d$m" | rev)
        if [ "$d" -le 31 ] && [ "$m" -le 12 ] && [ "$rv" == "$y" ]; then
                if date -d "${y}-${m}-${d}" > /dev/null 2>&1; then
                        echo "$d-$m-$y"
                fi
        fi
done

Result: