reserved where meaningful,
 so "Md" would give a different result to "MMMd", say, except in a locale such as
 <code>ja_JP</code> where there is only one length of month.

 <p>This method will only return patterns that are in CLDR, and is useful whenever
 you know what elements you want in your format string but don't want to make your
 code specific to any one locale.</p></div>
  <div class="jd-tagdata">
      <h5 class="jd-tagtitle">Parameters</h5>
      <table class="jd-tagtable">
        <tr>
          <