List Timezones Using Bash

ListTimeInZone.sh

#!/usr/bin/env bash

for tz in Asia/Kolkata US/Eastern Europe/Berlin Asia/Dubai Asia/Singapore Australia/Sydney; do
    echo -en "\n$tz "
    for i in $(seq -f %02g 0 23); do
        echo -n $(TZ=":${tz}" date --date="TZ=\"Asia/Kolkata\" ${i}00" +%H:%M )" "
    done
    echo ""
done | column -s " " -t 2>/dev/null

Output: