pattern for use with the datetime attribute.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>a SimpleDateFormat-compatible pattern string.</dd></dl>
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<h4>setWhen</h4>
<pre>public&nbsp;void&nbsp;setWhen(<a href="../../../../../../../org/apache/tools/ant/types/TimeComparison.html" title="class in org.apache.tools.ant.types">TimeComparison</a>&nbsp;c)</pre>
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