Usage:
hwclock [function] [option...]
Functions:
-h, --help show this help text and exit
-r, --show read hardware clock and print result
--set set the RTC to the time given with --date
-s, --hctosys set the system time from the hardware clock
-w, --systohc set the hardware clock from the current system time
--systz set the system time based on the current timezone
--adjust adjust the RTC to account for systematic drift since
the clock was last set or adjusted
--getepoch print out the kernel's hardware clock epoch value
--setepoch set the kernel's hardware clock epoch value to the
value given with --epoch
--predict predict RTC reading at time given with --date
-V, --version display version information and exit
Options:
-u, --utc the hardware clock is kept in UTC
--localtime the hardware clock is kept in local time
-f, --rtc <file> special /dev/... file to use instead of default
--directisa access the ISA bus directly instead of /dev/rtc
--badyear ignore RTC's year because the BIOS is broken
--date <time> specifies the time to which to set the hardware clock
--epoch <year> specifies the year which is the beginning of the
hardware clock's epoch value
--noadjfile do not access /etc/adjtime; this requires the use of
either --utc or --localtime
--adjfile <file> specifies the path to the adjust file;
the default is /etc/adjtime
--test do not update anything, just show what would happen
-D, --debug debugging mode
