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#!/bin/sh
# DATE From To
while getopts cfF: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
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