#!/bin/bash

if [ -z "$1" ]
then
        args="US/Eastern US/Pacific"
else
        args=$@
fi


for i in $args
do
        if [ -f "/usr/share/zoneinfo/$i" ]
        then
                echo ${i}: $(TZ="$i" date)
        else
                echo Error: Timezone $i not exist.
                exit 1
        fi
done

exit 0