NAME

       adjtime - information about hardware clock setting and drift factor

SYNOPSIS

       /etc/adjtime

DESCRIPTION

       The  file  /etc/adjtime  contains  descriptive  information  about the hardware mode clock
       setting and clock drift factor.  The file is read  and  write  by  hwclock;  and  read  by
       programs like rtcwake to get RTC time mode.

       The  file is usually located in /etc, but tools like hwclock(8) or rtcwake(8) allow to use
       alternative location by command line options if write access to  /etc  is  unwanted.   The
       default clock mode is "UTC" if the file is missing.

       The  Hardware  Clock  is  usually  not  very accurate.  However, much of its inaccuracy is
       completely predictable - it gains or loses the same amount of time  every  day.   This  is
       called  systematic  drift.   The util hwclock keeps the file /etc/adjtime, that keeps some
       historical information.  For more details see "The  Adjust  Function"  and   "The  Adjtime
       File" sections from hwckock(8) man page.

       The format of the adjtime file is, in ASCII.

   First line
       Three numbers, separated by blanks:

       drift factor
              the systematic drift rate in seconds per day (floating point decimal)

       last adjust time
              the  resulting  number  of  seconds since  1969  UTC  of  most recent adjustment or
              calibration (decimal integer)

       adjustment status
              zero (for compatibility with clock(8)) as a decimal integer.

   Second line
       last calibration time
              The resulting number of seconds since 1969 UTC of most recent calibration.  Zero if
              there  has  been no calibration yet or it is known that any previous calibration is
              moot  (for  example,  because  the  Hardware  Clock  has  been  found,  since  that
              calibration, not to contain a valid time).  This is a decimal integer.

   Third line
       clock mode
              Supported  values are "UTC" or "LOCAL".  Tells whether the Hardware Clock is set to
              Coordinated Universal Time or local time.  You can always override this value  with
              options on the hwclock command line.

FILES

       /etc/adjtime

SEE ALSO

       hwclock(8), rtcwake(8)

AVAILABILITY

       This   man   page   is   part   of   the   util-linux   package   and  is  available  from
       https://www.kernel.org/pub/linux/utils/util-linux/.