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<title>About the NLS_DATE_LANGUAGE Parameter</title>
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<p><a id="CACDGDBG" name="CACDGDBG"></a><a id="TDDDG99982" name="TDDDG99982"></a></p>
<div class="sect2">
<h1>About the NLS_DATE_LANGUAGE Parameter</h1>
<a name="BEGIN" id="BEGIN"></a>
<p><a id="sthref668" name="sthref668"></a><span class="bold">Specifies:</span> Language for names and abbreviations of days and months that are produced by:</p>
<ul>
<li>
<p>SQL functions <code>TO_CHAR</code> and <code>TO_DATE</code> (which are introduced in <a href="tdddg_selecting016.htm#BCGFDEJD">"Using Conversion Functions in Queries"</a>)</p>
</li>
<li>
<p>Default date format (set by <code>NLS_DATE_FORMAT</code>, described in <a href="tdddg_globalization019.htm#CACIFHHI">"About the NLS_DATE_FORMAT Parameter"</a>)</p>
</li>
<li>
<p>Symbols for default-language equivalents of AM, PM, AD, and BC</p>
</li>
</ul>
<p><span class="bold">Acceptable Values:</span> Any language name that Oracle supports. For a list, see <a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=NLSPG014','newWindow').focus()"><span class="italic">Oracle Database Globalization Support Guide</span></a>.</p>
<p><span class="bold">Default Value:</span> Set by <code>NLS_LANGUAGE</code>, described in <a href="tdddg_globalization017.htm#CACCIJIA">"About the NLS_LANGUAGE Parameter"</a>.</p>
<p>The following example shows how setting <code>NLS_DATE_LANGUAGE</code> to <code>FRENCH</code> and <code>SWEDISH</code> affects the displayed system date.</p>
<p>To try this example in SQL&nbsp;Developer, enter the statements and queries in the SQL&nbsp;Worksheet. For information about the SQL&nbsp;Worksheet, see <a href="tdddg_selecting002.htm#BCGHHIJG">"Running Queries in SQL&nbsp;Developer"</a>. The results shown here are from SQL*Plus; their format is slightly different in SQL&nbsp;Developer.</p>
<div class="example"><a id="CACFGIFI" name="CACFGIFI"></a><a id="TDDDG263" name="TDDDG263"></a>
<p class="titleinexample">NLS_DATE_LANGUAGE Affects Displayed SYSDATE</p>
<ol>
<li><a id="CACFFCHH" name="CACFFCHH"></a>
<p>Note the current value of <code>NLS_DATE_LANGUAGE</code>.</p>
<p>For instructions, see <a href="tdddg_globalization011.htm#CACIIJGI">"Viewing NLS Parameter Values"</a>.</p>
</li>
<li>
<p>If the value of <code>NLS_DATE_LANGUAGE</code> in step&nbsp;<a href="#CACFFCHH">1</a> is not <code>FRENCH</code>, change it:</p>
<pre xml:space="preserve" class="oac_no_warn">
ALTER SESSION SET <span class="bold">NLS_DATE_LANGUAGE=FRENCH</span>;
</pre></li>
<li><a id="CACBJEDF" name="CACBJEDF"></a>
<p>Run this query:</p>
<pre xml:space="preserve" class="oac_no_warn">
SELECT TO_CHAR(SYSDATE, 'Day:Dd Month yyyy') "System Date"
FROM DUAL;
</pre>
<p>Result:</p>
<pre xml:space="preserve" class="oac_no_warn">
System Date
--------------------------
<span class="bold">Mercredi</span>:01 <span class="bold">Octobre</span>   2008
</pre></li>
<li>
<p>Change the value of <code>NLS_DATE_LANGUAGE</code> to <code>SWEDISH</code>:</p>
<pre xml:space="preserve" class="oac_no_warn">
ALTER SESSION SET <span class="bold">NLS_DATE_LANGUAGE=SWEDISH</span>;
</pre></li>
<li>
<p>Repeat the query from step&nbsp;<a href="#CACBJEDF">3</a>.</p>
<p>Result:</p>
<pre xml:space="preserve" class="oac_no_warn">
System Date
-------------------------
<span class="bold">Onsdag</span> :01 <span class="bold">Oktober</span>   2008
</pre></li>
<li>
<p>Set <code>NLS_DATE_LANGUAGE</code> to the value that it had at step&nbsp;<a href="#CACFFCHH">1</a>.</p>
</li>
</ol>
</div>

<div class="helpinfonotealso">
<h2>Related Topics</h2>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=NLSPG205','newWindow').focus()"><span class="italic">Oracle Database Globalization Support Guide</span></a></p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF06128','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a> for more information about the <code>TO_CHAR</code> function</p>
<p><a href="javascript:open('http://www.oracle.com/pls/db112/lookup?id=SQLRF06132','newWindow').focus()"><span class="italic">Oracle Database SQL Language Reference</span></a> for more information about the <code>TO_DATE</code> function</p>
<p><a href="tdddg_globalization004.htm#CACJDJFD">About Date and Time Formats</a></p>
<p><a href="tdddg_globalization012.htm#CACJAJGC">Changing NLS Parameter Values</a></p>
<p><a href="tdddg_globalization015.htm#CACHJFJF">About Individual NLS Parameters</a></p>
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