codetc@webubuntu:~$ date -R
Tue, 17 Dec 2013 18:23:01 +0800

codetc@webubuntu:~$ sudo tzselect
[sudo] password for codetc: 
Please identify a location so that time zone rules can be set correctly.
Please select a continent or ocean.
 1) Africa
 2) Americas
 3) Antarctica
 4) Arctic Ocean
 5) Asia
 6) Atlantic Ocean
 7) Australia
 8) Europe
 9) Indian Ocean
10) Pacific Ocean
11) none - I want to specify the time zone using the Posix TZ format.
#? 5

Please select a country.
 1) Afghanistan      18) Israel        35) Palestine
 2) Armenia        19) Japan         36) Philippines
 3) Azerbaijan      20) Jordan        37) Qatar
 4) Bahrain        21) Kazakhstan      38) Russia
 5) Bangladesh      22) Korea (North)     39) Saudi Arabia
 6) Bhutan        23) Korea (South)     40) Singapore
 7) Brunei        24) Kuwait        41) Sri Lanka
 8) Cambodia       25) Kyrgyzstan      42) Syria
 9) China         26) Laos         43) Taiwan
10) Cyprus        27) Lebanon        44) Tajikistan
11) East Timor      28) Macau         45) Thailand
12) Georgia        29) Malaysia       46) Turkmenistan
13) Hong Kong       30) Mongolia       47) United Arab Emirates
14) India         31) Myanmar (Burma)    48) Uzbekistan
15) Indonesia       32) Nepal         49) Vietnam
16) Iran         33) Oman         50) Yemen
17) Iraq         34) Pakistan
#? 9

Please select one of the following time zone regions.
1) east China - Beijing, Guangdong, Shanghai, etc.
2) Heilongjiang (except Mohe), Jilin
3) central China - Sichuan, Yunnan, Guangxi, Shaanxi, Guizhou, etc.
4) most of Tibet & Xinjiang
5) west Tibet & Xinjiang
#? 1

The following information has been given:
    China
    east China - Beijing, Guangdong, Shanghai, etc.
Therefore TZ='Asia/Shanghai' will be used.
Local time is now:   Tue Dec 17 18:22:10 CST 2013.
Universal Time is now: Tue Dec 17 10:22:10 UTC 2013.
Is the above information OK?
1) Yes
2) No
#? 1
You can make this change permanent for yourself by appending the line
    TZ='Asia/Shanghai'; export TZ
to the file '.profile' in your home directory; then log out and log in again.
Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Shanghai

sudo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

sudo ntpdate time.windows.com

sudo hwclock --systohc