输入 date命令，发现时间不对，少了8个小时，

# date
Tue Dec 15 12:00:02 UTC 2020

 修改成北京时间

第一步：输入 sudo tzselect 命令

# sudo 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

这里是让我们选择一个位置，选择 4 然后回车，4：表示亚洲，出现下面的页面

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

 这里选择国家，我们选择 9，9表示中国，然后回车，出现以下画面

Please select one of the following time zone regions.
1) Beijing Time
2) Xinjiang Time

 这里让我们选择时区，选择 1，1就是北京时间，然后回车，出现以下画面

The following information has been given:

	China
	Beijing Time

Therefore TZ='Asia/Shanghai' will be used.
Selected time is now:	Tue Dec 15 20:03:32 CST 2020.
Universal Time is now:	Tue Dec 15 12:03:32 UTC 2020.
Is the above information OK?
1) Yes
2) No

 可以看到我们现在的时区已经修改过来了，Asia/Shanghai 亚洲/上海，这里提示我们是否保存，选择 1，然后回车

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

 这样时区就改过来了，搞个软连接把本机的时区文件覆盖以下：

# sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

同步硬件时间到系统时间

# sudo hwclock --systohc

再试：

# date
Tue Dec 15 20:03:54 CST 2020

 正常了！