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