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05. 資料收集/Linux/更改時區.md
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05. 資料收集/Linux/更改時區.md
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# 前置條件
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你需要有 **root** 或是 **sudo** 的權限才能更改系統的時區
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# 檢查當前時區
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在 Ubuntu 中,我們有三種方式查看當前時區設定
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## 1. 使用 `timedatectl` 命令顯示當前的系統時區。
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```
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timedatectl
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```
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```result
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Local time: Fri 2021-01-07 22:45:47 UTC
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Universal time: Fri 2021-01-07 22:45:47 UTC
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RTC time: Fri 2021-01-07 22:45:48
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Time zone: Etc/UTC (UTC, +0000)
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System clock synchronized: yes
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systemd-timesyncd.service active: yes
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RTC in local TZ: no
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```
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## 2. 查看 `/etc/localtime` 的連結指向
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```
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ls -l /etc/localtime
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```
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```result
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lrwxrwxrwx 1 root root 33 Jan 8 15:57 /etc/localtime -> ../usr/share/zoneinfo/Etc/UTC
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```
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## 3. 查看 `/etc/timezome` 的內容
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```
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cat /etc/timezone
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```
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```result
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Etc/UTC
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```
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# 修改時區
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當我們檢查完時區後,接下來就是修改時區。不過假如你不知道要改的時區名稱,你可以透過以下指令來查看
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```
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timedatectl list-timezones
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```
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```result
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...
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Asia/Seoul
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Asia/Shanghai
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Asia/Singapore
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Asia/Srednekolymsk
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Asia/Taipei
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Asia/Tashkent
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Asia/Tbilisi
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Asia/Tehran
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Asia/Thimphu
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Asia/Tokyo
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...
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```
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找到要修改的時區名稱後,接下就是以 sudo 權限執行以下命令
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```
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sudo timedatectl set-timezone 要修改的時區名稱
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```
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例如要將系統修改為台北時區 `Asia/Taipei`,請輸入
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```
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sudo timedatectl set-timezone Asia/Taipei
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```
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使用 `timedatectl` 指令確認時區是否正確修改
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```
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timedatectl
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```
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```result
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Local time: Fri 2021-01-08 18:38:49 CST
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Universal time: Fri 2021-01-08 10:38:49 UTC
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RTC time: Fri 2021-01-08 10:38:49
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Time zone: Asia/Taipei (CST, +0800)
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System clock synchronized: yes
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systemd-timesyncd.service active: yes
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RTC in local TZ: no
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```
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# 參考
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- [如何正確修改 Ubuntu 18.04 的系統時區](https://www.hanktsai.com/2021/01/configure-ubuntu1804-timezone.html)
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