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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/testing/BOOK@4001 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
58 lines
2.5 KiB
XML
58 lines
2.5 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-scripts-setclock">
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<title>Configuring the setclock script</title>
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<?dbhtml filename="setclock.html"?>
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<indexterm zone="ch-scripts-setclock">
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<primary sortas="d-setclock">setclock</primary>
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<secondary>configuring</secondary></indexterm>
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<para>The <command>setclock</command> script reads the time from the hardware clock,
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also known as BIOS or the Complementary Metal Oxide Semiconductor
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(CMOS) clock. If the hardware clock is set to Universal Coordinated
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Time (UTC), this script will convert the hardware clock's time to
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your local time using the <filename>/etc/localtime</filename> file
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(which tells hwclock which timezone you are in). There is no way to
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detect whether or not your hardware clock is set to UTC time, so this
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needs to be manually configured.</para>
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<para>If you can't remember whether or not you have set your hardware
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clock to UTC time, you can find out by following this procedure. Run
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the <userinput>hwclock --show</userinput> command. This will tell you
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what the current time according to the hardware clock is. If this time
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matches whatever your watch says, then your hardware clock is set to
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local time. If the output from <command>hwclock</command> is not local
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time, chances are it is set to UTC time. Verify this by adding or
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subtracting the proper amount of hours for your timezone to this
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<command>hwclock</command> time. For example, if you live in the MST
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timezone, which is also known as GMT -0700, add 7 hours to the local
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time. Then account for Daylight Savings Time which means you have to
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remove an hour (or only add 6 in the first place) during the summer
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months.</para>
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<para>Change the value of the <emphasis>UTC</emphasis> variable below
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to a value of <parameter>0</parameter> (zero) if your hardware clock
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is <emphasis>not</emphasis> set to UTC time.</para>
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<para>Create a new file <filename>/etc/sysconfig/clock</filename> by running
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the following:</para>
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<screen><userinput>cat > /etc/sysconfig/clock << "EOF"
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# Begin /etc/sysconfig/clock
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UTC=1
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# End /etc/sysconfig/clock
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EOF</userinput></screen>
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<para>A good hint explaining how to deal with time on LFS is available
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at <ulink url="&hints-root;time.txt"/>. It explains issues such as
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time zones, UTC, and the TZ environment variable.</para>
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</sect1>
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