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/usr/share/help/C/gnome-help/clock-set.page is in gnome-user-guide 3.4.1-1.

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<page xmlns="http://projectmallard.org/1.0/"
      type="topic" style="task"
      id="clock-set">

  <info>
    <link type="guide" xref="clock"/>
    <desc>Click the clock on the top bar and go into the <gui>Date and Time Settings</gui>
    to alter the date/time.</desc>
    <revision pkgversion="3.4.0" date="2012-02-19" status="outdated"/>
    <credit type="author">
      <name>GNOME Documentation Project</name>
      <email>gnome-doc-list@gnome.org</email>
    </credit>

    <include href="legal.xml" xmlns="http://www.w3.org/2001/XInclude"/>
  </info>

<title>Change the date and time</title>

  <p>If the date and time displayed on the top bar are incorrect or in the wrong
 format, you can change them:</p>

<steps>
 <item>
  <p>Click on the clock in the middle of the top bar and select
  <gui>Date and Time Settings</gui>.</p>
 </item>
 <item>
  <p>You may need to click <gui>Unlock</gui> and type the
  <link xref="user-admin-explain">admin password</link>.</p>
 </item>
 <item>
  <p>Adjust the date and time by clicking on the arrows to choose the year,
  day, hour and minute. You can choose the month from a drop-down list.</p>
 </item>
 <item>
  <p>If you like, you can have the clock update itself automatically by
  switching <gui>Network Time</gui> on.</p>
  <p>When <em>Network Time</em> is switched on, the computer will periodically
  synchronize its clock with a very accurate clock on the internet, so you don't
  have to do it manually. This will only work if you are connected to the
  internet.</p>
 </item>
 <item>
  <p>You can also change how the hour is displayed by switching the 24-hour
  format on or off.</p>
 </item>
</steps>

</page>