The setclock script reads the time from the
hardware clock, also known as the BIOS or the Complementary Metal Oxide
Semiconductor (CMOS) clock. If the hardware clock is set to UTC, this
script will convert the hardware clock's time to the local time using
the /etc/localtime
file (which tells the
hwclock program which timezone the user is in). There
is no way to detect whether or not the hardware clock is set to UTC, so
this needs to be configured manually.
If you cannot remember whether or not the hardware clock is set
to UTC, find out by running the hwclock --localtime
--show
command. This will display what the current time is
according to the hardware clock. If this time matches whatever your
watch says, then the hardware clock is set to local time. If the output
from hwclock is not local time, chances are it is set
to UTC time. Verify this by adding or subtracting the proper amount of
hours for the timezone to the time shown by hwclock.
For example, if you are currently in the MST timezone, which is also
known as GMT -0700, add seven hours to the local time.
Change the value of the UTC
variable below
to a value of 0
(zero) if the hardware clock
is not set to UTC time.
Create a new file /etc/sysconfig/clock
by running
the following:
cat > /etc/sysconfig/clock << "EOF"
# Begin /etc/sysconfig/clock
UTC=1
# End /etc/sysconfig/clock
EOF
A good hint explaining how to deal with time on CLFS is available
at http://hints.cross-lfs.org/index.php/time.txt. It explains issues such as
time zones, UTC, and the TZ
environment variable.