| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-scripts-clock">
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| 9 | <?dbhtml filename="clock.html"?>
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| 10 |
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| 11 | <title>Configuring the system clock</title>
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| 12 |
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| 13 | <indexterm zone="ch-scripts-clock">
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| 14 | <primary sortas="d-clock">clock</primary>
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| 15 | <secondary>configuring</secondary></indexterm>
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| 16 |
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| 17 | <para>This section discusses how to configure the
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| 18 | <command>systemd-timedated</command> system service, which configures
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| 19 | system clock and timezone.</para>
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| 20 |
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| 21 | <para>Systemd provides a <command>timedatectl</command> utility which is
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| 22 | used to communicate with <command>systemd-timedated</command>. It can be used
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| 23 | to set the system clock in local time or UTC time, depending on the hardware
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| 24 | clock setting. By default, <command>systemd-timedated</command> will assume
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| 25 | that clock is set to UTC time.</para>
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| 26 |
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| 27 | <para>If you cannot remember whether or not the hardware clock is set to UTC,
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| 28 | find out by running the <userinput>hwclock --localtime --show</userinput>
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| 29 | command. This will display what the current time is according to the hardware
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| 30 | clock. If this time matches whatever your watch says, then the hardware clock is
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| 31 | set to local time. If the output from <command>hwclock</command> is not local
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| 32 | time, chances are it is set to UTC time. Verify this by adding or subtracting
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| 33 | the proper amount of hours for the timezone to the time shown by
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| 34 | <command>hwclock</command>. For example, if you are currently in the MST
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| 35 | timezone, which is also known as GMT -0700, add seven hours to the local
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| 36 | time.</para>
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| 37 |
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| 38 | <para>If your clock is set to local time, tell <command>systemd-timedated</command>
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| 39 | about it by running the following command:</para>
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| 40 |
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| 41 | <screen role="nodump"><userinput>timedatectl set-local-rtc 1</userinput></screen>
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| 42 |
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| 43 | <para><command>timedatectl</command> can also be used to change system time and
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| 44 | time zone.</para>
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| 45 |
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| 46 | <para>To change your current system time, issue:</para>
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| 47 |
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| 48 | <screen role="nodump"><userinput>timedatectl set-time YYYY:MM:DD HH:MM:SS</userinput></screen>
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| 49 |
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| 50 | <para>Hardware clock will also be updated accordingly.</para>
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| 51 |
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| 52 | <para>To change your current time zone, issue:</para>
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| 53 |
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| 54 | <screen role="nodump"><userinput>timedatectl set-timezone TIMEZONE</userinput></screen>
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| 55 |
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| 56 | <para>You can get list of available time zones by running:</para>
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| 57 |
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| 58 | <screen role="nodump"><userinput>timedatectl list-timezones</userinput></screen>
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| 59 |
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| 60 | <note><para>Please note that <command>timedatectl</command> command can
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| 61 | be used only on a system booted with Systemd.</para></note>
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| 62 |
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| 63 | </sect1>
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