aaron@ubuntu:~$ tzselect

Please identify a location so that time zone rules can be set correctly.

Please select a continent, ocean, "coord", or "TZ".

 ) Africa

 ) Americas

 ) Antarctica

 ) Asia

 ) Atlantic Ocean

 ) Australia

 ) Europe

 ) Indian Ocean

 ) Pacific Ocean

) coord - I want to use geographical coordinates.

) TZ - I want to specify the time zone using the Posix TZ format.

#?

Please select a country whose clocks agree with yours.

 ) Afghanistan           ) Israel                ) Palestine

 ) Armenia               ) Japan                 ) Philippines

 ) Azerbaijan            ) Jordan                ) Qatar

 ) Bahrain               ) Kazakhstan            ) Russia

 ) Bangladesh            ) Korea (North)         ) Saudi Arabia

 ) Bhutan                ) Korea (South)         ) Singapore

 ) Brunei                ) Kuwait                ) Sri Lanka

 ) Cambodia              ) Kyrgyzstan            ) Syria

 ) China                 ) Laos                  ) *

) Cyprus                ) Lebanon               ) Tajikistan

) East Timor            ) Macau                 ) Thailand

) Georgia               ) Malaysia              ) Turkmenistan

) *             ) *              ) United Arab Emirates

) India                 ) Myanmar (Burma)       ) Uzbekistan

) Indonesia             ) Nepal                 ) Vietnam

) Iran                  ) Oman                  ) Yemen

) Iraq                  ) Pakistan

#?

Please select one of the following time zone regions.

) Beijing Time

) * Time

#? 

The following information has been given:

        China

        Beijing Time

Therefore TZ='Asia/Shanghai' will be used.

Local time is now:      Thu May  :: CST .

Universal Time is now:  Thu May  :: UTC .

Is the above information OK?

) Yes

) No

#? 

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

// 此时时区还没有修改成功

// 根据提示输入 TZ='Asia/Shanghai'; export TZ 但重启后又失效

aaron@ubuntu:~$ date

Wed May  :: PDT

aaron@ubuntu:~$ sudo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

[sudo] password for aaron:

// 更新时间时，提示没有安装 ntpdate

aaron@ubuntu:~$ sudo ntpdate time.windows.com

sudo: ntpdate: command not found

// 安装

aaron@ubuntu:~$ sudo apt-get install ntpdate

// 更新时间

aaron@ubuntu:~$ sudo ntpdate time.windows.com

 May :: ntpdate[]: adjust time server 51.140.127.197 offset 0.044998 sec

aaron@ubuntu:~$ date

Thu May  :: CST

// 重启

aaron@ubuntu:~$ sudo reboot

// 时区设置成功

aaron@ubuntu:~$ date

Thu May  :: CST