src/references/instructions/client/handshake/timezone.xml

<?xml version="1.0" encoding="UTF-8"?>

<section xml:id="timezone-handshake-instruction"
    xmlns="http://docbook.org/ns/docbook" version="5.0" xml:lang="en"
    xmlns:xi="http://www.w3.org/2001/XInclude">
    <title>timezone</title>
    <indexterm>
        <primary>timezone</primary>
    </indexterm>
    <para>Specifies the timezone of the client system, in IANA zone key format.
        This is a single-value parameter, and may be used by protocols to
        set the timezone on the remote computer, if the remote system allows
        the timezone to be configured.  This instruction is optional.</para>
    <variablelist>
        <varlistentry>
            <term><parameter>timezone</parameter></term>
            <listiem>
                <para>A valid IANA time zone key that indicates the time zone
                that the client is currently using.</para>
            </listiem>
        </varlistentry>
    </variablelist>
</section>