AWS EC2インスタンス作成時 User DataによりタイムゾーンをJSTに変更する ref: http://qiita.com/na0AaooQ/items/52dea5f982745592a663

file0.txt

$ date
Tue Dec 23 01:30:39 UTC 2014
$ cat /etc/sysconfig/clock
ZONE="UTC"
UTC=true
$

file1.txt

#!/bin/sh

echo "User Data start"

yum -y update

unalias cp
cp -f -p /usr/share/zoneinfo/Japan /etc/localtime

cat << _EOT_ > /etc/sysconfig/clock
ZONE="Asia/Tokyo"
UTC=false
_EOT_

chmod 644 /etc/sysconfig/clock

/etc/init.d/crond restart

echo "User Data end"

file2.txt

$ date
Tue Dec 23 11:19:45 JST 2014
$ cat /etc/sysconfig/clock
ZONE="Asia/Tokyo"
UTC=false
$

$ sudo yum update
Loaded plugins: priorities, update-motd, upgrade-helper
amzn-main/latest                                         | 2.1 kB     00:00
amzn-updates/latest                                      | 2.3 kB     00:00
No packages marked for update
$

file3.txt

cat /var/log/cloud-init-output.log

file4.txt

cat /var/lib/cloud/instance/user-data.txt