y-constant.html">sunday</a></li>
      <li><a href="dart-core/DateTime/thursday-constant.html">thursday</a></li>
      <li><a href="dart-core/DateTime/tuesday-constant.html">tuesday</a></li>
      <li><a href="dart-core/DateTime/wednesday-constant.html">wednesday</a></li>
    </ol>
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  <div id="dartdoc-main-content" class="col-xs-12 col-sm-9 col-md-8 main-content">
      <div><h1><span class="kind-method">isBefore</span> method</h1></div>

    <section class="multi-line-sig