最終更新:2022-01-04 (火) 12:33:05 (927d)  

hwclock
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Time clocks utility.

デュアルブートで時計がずれるとき

メモ

  • hwclock --systohc
    • ローカル時間にする
      hwclock -D --systohc --localtime 
  • UTCにする
    sudo hwclock -D --systohc --utc

–systohc

  • set the SYStem time TO the Hardware Clockの略
  • システム時刻を、ローカル時としてハードウェアクロックにセットしなさいと指示

メモ

  • -D : use --verbose

help

  • Usage:
     hwclock [function] [option...]
    
    Time clocks utility.
    
    Functions:
     -r, --show           display the RTC time
         --get            display drift corrected RTC time
         --set            set the RTC according to --date
     -s, --hctosys        set the system time from the RTC
     -w, --systohc        set the RTC from the system time
         --systz          send timescale configurations to the kernel
     -a, --adjust         adjust the RTC to account for systematic drift
         --predict        predict the drifted RTC time according to --date
    
    Options:
     -u, --utc            the RTC timescale is UTC
     -l, --localtime      the RTC timescale is Local
     -f, --rtc <file>     use an alternate file to /dev/rtc0
         --directisa      use the ISA bus instead of /dev/rtc0 access
         --date <time>    date/time input for --set and --predict
         --delay <sec>    delay used when set new RTC time
         --update-drift   update the RTC drift factor
         --noadjfile      do not use /etc/adjtime
         --adjfile <file> use an alternate file to /etc/adjtime
         --test           dry run; implies --verbose
     -v, --verbose        display more details
    
     -h, --help           display this help
     -V, --version        display version
    
    For more details see hwclock(8).
    

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