[LINUX] How to set the server time to Japanese time

When the server time was the standard time in the world

If nothing is set, this should happen, but since I am Japanese and live in Tokyo, Tokyo time is good.

$ date
Fri Jun 12 04:32:25 UTC 2020

For CentOS7

--Environment: CentOS Linux release 7.8.2003 (Core)

#localtime is linked to UTC
$ ls -la /etc/localtime
lrwxrwxrwx. 1 root root 25 Feb 29 12:11 /etc/localtime -> ../usr/share/zoneinfo/UTC

#When I searched for Japan for a moment, I found "Asia" and "Japan".
$ ls -la /usr/share/zoneinfo/ | grep -e Asia -e Japan
drwxr-xr-x.  2 root root   4096 Feb 29 12:06 Asia
-rw-r--r--.  2 root root    292 Sep 26  2019 Japan

# `Asia/Tokyo`But`Japan`It seems that it is not linked to
$ ls -la /usr/share/zoneinfo/Asia/ | grep Tokyo
-rw-r--r--.  2 root root  292 Sep 26  2019 Tokyo

How to make Japan time only now

Reference: [Linux] Timezone change --Qiita

#Overwrite symbolic links in Tokyo
$ ln -sf /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
$  ls -la /etc/localtime
lrwxrwxrwx. 1 root root 30 Jun 15 10:45 /etc/localtime -> /usr/share/zoneinfo/Asia/Tokyo

$ date
Mon Jun 15 10:45:55 JST 2020

How to make it all the time in Japan

Reference: [[timedatectl] command-Display / set time: Linux basic command Tips (312)-@IT](https://www.atmarkit.co.jp/ait/articles/1906/13/news007. html)

$ timedatectl
      Local time: Tue 2020-06-30 06:20:07 UTC
  Universal time: Tue 2020-06-30 06:20:07 UTC
        RTC time: Tue 2020-06-30 06:20:07
       Time zone: UTC (UTC, +0000)

#If you look for something that looks like Japan, "Asia"/There was "Tokyo"
$ timedatectl list-timezones | grep -i -e japan -e tokyo

#Set the time zone to "Asia"/Set to "Tokyo"
$ sudo timedatectl set-timezone Asia/Tokyo

$ timedatectl
      Local time: Tue 2020-06-30 15:21:18 JST
  Universal time: Tue 2020-06-30 06:21:18 UTC
        RTC time: Tue 2020-06-30 06:21:18
       Time zone: Asia/Tokyo (JST, +0900)

$ date
Tue Jun 30 15:21:31 JST 2020

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