* マルチブート時の時刻設定 [#v2464714]


 $ sudo timedatectl set-local-rtc true


 $ sudo timedatectl status
                       Local time: 木 2019-12-26 15:34:14 JST
                   Universal time: 木 2019-12-26 06:34:14 UTC
                         RTC time: 木 2019-12-26 15:34:14
                        Time zone: Asia/Tokyo (JST, +0900)
        System clock synchronized: no
 systemd-timesyncd.service active: yes
                  RTC in local TZ: yes
 Warning: The system is configured to read the RTC time in the local time zone.
          This mode can not be fully supported. It will create various problems
          with time zone changes and daylight saving time adjustments. The RTC
          time is never updated, it relies on external facilities to maintain it.
          If at all possible, use RTC in UTC by calling
          'timedatectl set-local-rtc 0'.


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