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#!/bin/sh
# DATE From To

while getopts fF:t:T: opt; do
	case $opt in
		#c) tz_from="Asia/Shanghai";;
		f) tz_from="$(tzselect)";;
		F) tz_from="$OPTARG";;
		# one extra ',' at the end will not let `for tz in ...` loop one extra time?
		t)	for i in $(seq "$OPTARG"); do
				tz_to="$(tzselect),$tz_to"
			done;;
		T) tz_to="$OPTARG,$tz_to";;
		\?) exit 1;;
	esac
done
shift $((OPTIND-1))

time_from="TZ=\"${tz_from:-$(readlink /etc/localtime | sed 's#.*/\(.*/.*\)$#\1#')}\" ${1:-now}"

date -d "$time_from"
#TZ="Asia/Shanghai" date -d "$time_from"
date -d "$time_from" -u 
date -d "$time_from" +%s
[ "$tz_from" ] && [ "$tz_from" != "Asia/Shanghai" ] && TZ="$tz_from" date -d "$time_from"
IFS=',' 
for tz in $tz_to; do
	TZ="$tz" date -d "$time_from"
done