Ignore:
Timestamp:
02/19/2005 10:16:42 PM (19 years ago)
Author:
Gerard Beekmans <gerard@…>
Branches:
10.0, 10.0-rc1, 10.1, 10.1-rc1, 11.0, 11.0-rc1, 11.0-rc2, 11.0-rc3, 11.1, 11.1-rc1, 11.2, 11.2-rc1, 11.3, 11.3-rc1, 12.0, 12.0-rc1, 12.1, 12.1-rc1, 6.1, 6.1.1, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 7.0, 7.1, 7.2, 7.3, 7.4, 7.5, 7.5-systemd, 7.6, 7.6-systemd, 7.7, 7.7-systemd, 7.8, 7.8-systemd, 7.9, 7.9-systemd, 8.0, 8.1, 8.2, 8.3, 8.4, 9.0, 9.1, arm, bdubbs/gcc13, ml-11.0, multilib, renodr/libudev-from-systemd, s6-init, trunk, xry111/arm64, xry111/arm64-12.0, xry111/clfs-ng, xry111/lfs-next, xry111/loongarch, xry111/loongarch-12.0, xry111/loongarch-12.1, xry111/mips64el, xry111/pip3, xry111/rust-wip-20221008, xry111/update-glibc
Children:
3d31fc4
Parents:
2f9131f
Message:

Trunk is now identical to Testing

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/trunk/BOOK@4648 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689

File:
1 edited

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  • chapter07/setclock.xml

    r2f9131f r81fd230  
    88<?dbhtml filename="setclock.html"?>
    99
     10<indexterm zone="ch-scripts-setclock">
     11<primary sortas="d-setclock">setclock</primary>
     12<secondary>configuring</secondary></indexterm>
     13
     14<para>The <command>setclock</command> script reads the time from the hardware clock,
     15also known as BIOS or the Complementary Metal Oxide Semiconductor
     16(CMOS) clock. If the hardware clock is set to UTC, this script will convert the hardware clock's time to
     17the local time using the <filename>/etc/localtime</filename> file
     18(which tells the <command>hwclock</command> program which timezone the
     19user is in). There is no way to
     20detect whether or not the hardware clock is set to UTC time, so this
     21needs to be manually configured.</para>
     22
     23<para>If you cannot remember whether or not the hardware
     24clock is set to UTC time, find out by running
     25the <userinput>hwclock --localtime --show</userinput> command. This will tell
     26what the current time is according to the hardware clock. If this time
     27matches whatever your watch says, then the hardware clock is set to
     28local time. If the output from <command>hwclock</command> is not local
     29time, chances are it is set to UTC time. Verify this by adding or
     30subtracting the proper amount of hours for the timezone to this
     31<command>hwclock</command> time. For example, if you live in the MST
     32timezone, which is also known as GMT -0700, add seven hours to the local
     33time. Then, account for Daylight Savings Time, which requires
     34subtracting an hour (or only add six in the first place) during the summer
     35months.</para>
     36
     37<para>Change the value of the <envar>UTC</envar> variable below
     38to a value of <parameter>0</parameter> (zero) if the hardware clock
     39is <emphasis>not</emphasis> set to UTC time.</para>
    1040
    1141<para>Create a new file <filename>/etc/sysconfig/clock</filename> by running
    … …  
    2050EOF</userinput></screen>
    2151
     52<para>A good hint explaining how to deal with time on LFS is available
     53at <ulink url="&hints-root;time.txt"/>. It explains issues such as
     54time zones, UTC, and the <envar>TZ</envar> environment variable.</para>
     55
    2256</sect1>
     57
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