hwclock - query and set the hardware clock (RTC)
Usage: hwclock [function] [options...]
Functions:
-h | --help show this help
-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 to 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 print out the version of hwclock to stdout
Options:
-u | --utc the hardware clock is kept in UTC
--localtime the hardware clock is kept in local time
-f | --rtc=path special /dev/... file to use instead of default
--directisa access the ISA bus directly instead of
%s
--badyear ignore rtc's year because the bios is broken
--date 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. Requires the use of
either --utc or --localtime
--adjfile=path specifies the path to the adjust file (default is
/etc/adjtime)
--test do everything except actually updating the hardware
clock or anything else
-D | --debug debug mode
