hwclock – query and set the hardware clock

set the system time from the hardware clock

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root@s1 [~]# /sbin/hwclock –hctosys
root@s1 [~]#

set the hardware clock to the current system time

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root@s1 [~]# /sbin/hwclock –systohc
root@s1 [~]#

root@s1 [~]# /sbin/hwclock –help
hwclock – query and set the hardware clock (RTC)

Usage: hwclock [function] [options…]

Functions:
–help        show this help
–show        read hardware clock and print result
–set         set the rtc to the time given with –date
–hctosys     set the system time from the hardware clock
–systohc     set the hardware clock to the current system time
–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
–version     print out the version of hwclock to stdout

Options:
–utc         the hardware clock is kept in coordinated universal time
–localtime   the hardware clock is kept in local time
–directisa   access the ISA bus directly instead of /dev/rtc
–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

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