#!/bin/sh
# replace all UTC dates to local dates in pipe
# by HuangYingNing <huangyingning at google mail system>
# install:
# git clone https://github.com/HuangYingNing/docker-logs-localtime.git /usr/local/docker-logs-localtime && ln -s /usr/local/docker-logs-localtime/docker-logs-localtime /usr/local/bin/docker-logs-localtime && chmod +x /usr/local/docker-logs-localtime/docker-logs-localtime /usr/local/bin/docker-logs-localtime
# or:
# wget -O /usr/local/bin/docker-logs-localtime https://raw.githubusercontent.com/HuangYingNing/docker-logs-localtime/master/docker-logs-localtime && chmod +x /usr/local/bin/docker-logs-localtime
# usage: docker logs -t container_name 2>&1 | docker-logs-localtime

date_prefix=`date +%Y`-

while read -r dateUtc log
do
	if [ "${dateUtc:0:5}" == ${date_prefix} ]; then
		# 2020-03-04T09:38:58.836294000Z
		dateLocal=`date -d "UTC ${dateUtc:0:4}${dateUtc:5:2}${dateUtc:8:2} ${dateUtc:11:8}" '+%Y-%m-%d %H:%M:%S'`${dateUtc:19:9}
#		echo "local date is ${dateLocal} Utc date is ${dateUtc}"
		echo ${dateLocal} ${log}
	else
		echo ${dateUtc} ${log}
	fi
done