调整Linux系统为正确时区

一、如何调整Linux系统为正确时区
  一、查看当前的时区情况
# date

# date
Fri Jan  6 12:52:24 EST 2023
# ll -l /etc/localtime
lrwxrwxrwx. 1 root root 38 Jan  5 06:34 /etc/localtime -> ../usr/share/zoneinfo/America/New_York

  二、修改时区
　　修改时区方式有以下几种

　　1、获取时区TZ值
　　要更改 Linux 系统时区首先得获知你所当地时区的 TZ 值，使用 tzselect 命令即可查看并选择已安装的时区文件。

# 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
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) 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:	Sat Jan  7 01:55:12 CST 2023.
Universal Time is now:	Fri Jan  6 17:55:12 UTC 2023.
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

　　2、更改 Linux 系统整个系统范围的时区

# rm -f /etc/localtime 
# ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
# ll -l /etc/localtime
lrwxrwxrwx 1 root root 33 Jan  7 01:56 /etc/localtime -> /usr/share/zoneinfo/Asia/Shanghai

　　3、使用Systemd更改Linux系统时区
　　如果你使用的 Linux 系统使用 Systemd，还可以使用 timedatectl 命令来更改 Linux 系统范围的时区。在 Systemd 下有一个名为 systemd-timedated 的系统服务负责调整系统时钟和时区，我们可以使用 timedatectl 命令对此系统服务进行配置。

# timedatectl set-timezone 'Asia/Shanghai'