Misinterpret date formats like General Bison

bisonator.sh

#!/bin/bash

a=$(( ${1:-$(date +%d)} % 100 ))
b=$(( ${2:-$(date +%m)} % 100 ))
c=$(( ${3:-$(date +%y)} % 100 ))

input=$(printf "%02d-%02d-%02d" "$a" "$b" "$c")
for fmt in "%d-%m-%y" "%d-%y-%m" "%y-%d-%m" "%y-%m-%d" "%m-%y-%d" "%m-%d-%y"; do
  if [[ "$(date -j -f "$fmt" "$input" +%u 2>/dev/null || echo 0)" == "2" ]]; then
    date -j -f "$fmt" "$input" +"%B %e, %Y? For me, it was Tuesday." 2>/dev/null
    exit 0
  fi
done
# try harder
for y in {1..99}; do
  input=$(printf "%02d %02d-%02d-%02d" "$a" "$b" "$c" "$y")
  for fmt in "%H %d-%m-%y" "%H %m-%d-%y"; do
    if [[ "$(date -j -f "$fmt" "$input" +%u 2>/dev/null || echo 0)" == "2" ]]; then
      date -j -f "$fmt" "$input" +"%I %p %B %e, %Y? For me, it was Tuesday." 2>/dev/null
      exit 0
    fi
  done
done

echo "For you, that day Bison graced your village was the most important day of your life."