1.首先查看时区：

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

如果要修改时区，执行sudo tzselect

2.选择区域：亚洲

swfsadmin@swfsubuntu:~$ sudo tzselect
[sudo] password for swfsadmin: 
Sorry,try again.
[sudo] password for swfsadmin: 
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

3.选择国家：中国

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

4.选择时区：北京时间

5.确认验证：

The following information has been given:

        China
        east China - Beijing,etc.

Therefore TZ='Asia/Shanghai' will be used.
Local time is now:      Tue Dec 17 22:10 CST 2013.
Universal Time is now:  Tue Dec 10:10 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='; 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

改时间参考：

http://5154091.blog.hexun.com/30735220_d.html

修改时间

sudo date -s MM/DD/YY @H_130_404@//修改日期
sudo date -s hh:mm:ss 修改时间

在修改时间以后，修改硬件CMOS的时间

sudo hwclock --systohc 非常重要，如果没有这一步的话，后面时间还是不准

http://www.cnblogs.com/php5/archive/2011/02/15/1955432.html

http://os.51cto.com/art/200908/142234.htm

root@fb9f6ef6c5b3:/usr/local/gitserver# date -R
Tue,24 Jan 2017 08:07:34 +0000
root@fb9f6ef6c5b3:/usr/local/gitserver# tzselect
Please identify a location so that time zone rules can be set correctly.
Please select a continent,ocean,"coord",or "TZ".
 1) Africa
 2) Americas
 3) Antarctica
 4) Asia
 5) Atlantic Ocean
 6) Australia
 7) Europe
 8) Indian Ocean
 9) Pacific Ocean
10) coord - I want to use geographical coordinates.
11) TZ - I want to specify the time zone using the Posix TZ format.
#? 4
Please select a country whose clocks agree with yours.
 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) Beijing Time
2) Xinjiang Time
#? 1

The following information has been given:

	China
	Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Local time is now:	Tue Jan 24 16:08:19 CST 2017.
Universal Time is now:	Tue Jan 24 08:08:19 UTC 2017.
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
root@fb9f6ef6c5b3:/usr/local/gitserver# vim ~/.profile
root@fb9f6ef6c5b3:/usr/local/gitserver# date -R
Tue,24 Jan 2017 08:10:40 +0000
root@fb9f6ef6c5b3:/usr/local/gitserver# date
Tue Jan 24 08:10:59 UTC 2017
root@fb9f6ef6c5b3:/usr/local/gitserver# cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime 
root@fb9f6ef6c5b3:/usr/local/gitserver# date -R
Tue,24 Jan 2017 16:11:47 +0800