這裡的時區是 Asia/Tehran，但 ubuntu 時間比當地時間早 5H30M。
我檢查了配置，甚至安裝了 ntp 伺服器，似乎沒有什麼可以解決這個問題，
sudo dpkg-reconfigure tzdata
Current default time zone: 'Asia/Tehran'
Local time is now: Thu May 9 00:49:38 IRDT 2013.
Universal Time is now: Wed May 8 20:19:38 UTC 2013.
/etc/ntp.conf
driftfile /var/lib/ntp/ntp.drift
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
server ir.pool.ntp.org
server in.pool.ntp.org
server tr.pool.ntp.org
server ntp.ubuntu.com
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery
restrict 127.0.0.1
restrict ::1
以下是目前的情況
$ date
Sun May 12 17:15:39 IRDT 2013
$ date --utc
Sun May 12 12:45:40 UTC 2013
according to Google my local time is
11:45 AM Sunday, May 12, 2013 (IRDT)