ubuntu 更改时区 tzselect

Ubuntu 服务器 更改时区：

tzselect 命令使用：

xusongqin@xusongqin-x64-A75MG:/etc/default$ date
Thu Dec 12 10:06:03 EST 2013 ##查看时区为EST。

xusongqin@xusongqin-x64-A75MG:/etc/default$ tzselect
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 ## 使用数字选择
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: Thu Dec 12 23:05:55 CST 2013.
Universal Time is now: Thu Dec 12 15:05:55 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  ##必須执行该命令，如下。
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

xusongqin@xusongqin-x64-A75MG:/etc/default$ date
Thu Dec 12 10:06:03 EST 2013 ##需将时区激活
xusongqin@xusongqin-x64-A75MG:/etc/default$ TZ='Asia/Shanghai'; export TZ
xusongqin@xusongqin-x64-A75MG:/etc/default$ date
Thu Dec 12 23:07:01 CST 2013 ##切换回中国

## 按照提示进行选择时区
sudo cp /usr/share/zoneinfo/Asia/ShangHai /etc/localtime
## 执行
sudo ntpdate cn.pool.ntp.org
cn.pool.ntp.org是位于中国的公共NTP服务器，用来同步你的时间


地理常识：
美国横跨西五区至西十区，共六个时区。
每个时区对应一个标准时间，从东向西分别为东部时间(EST)(西五区时间)、中部时间(CST)(西六区时间)、山地时间(MST)(西七区时间)、太平洋时间(西部时间)(PST)(西八区时间)、阿拉斯加时间(AKST)(西九区时间)和夏威夷时间(HST)(西十区时间)