Bash7

Palindromic dates
ispal { date -d "$1" 1>/dev/null 2>&1 && echo "$1" ; } for _H in {2..9}; do for _I in {0..9}; do   for _J in {0..99}; do    ispal ${_H}${_I}`printf "%02d%s" ${_J}`-`printf "%02d%s" ${_J} | rev`-`printf "%02d%s" ${_H}${_I} | rev` done done done
 * 1) !/bin/bash