title: Year-Week-Day in java.time?
body: <p>Is there support in the <a href="https://docs.oracle.com/javase/8/docs/api/java/time/package-summary.html" rel="nofollow noreferrer">java.time</a> classes, or its extension <a href="https://github.com/ThreeTen/threeten-extra" rel="nofollow noreferrer">ThreeTen-Extra</a>, for a <a href="https://en.wikipedia.org/wiki/ISO_8601#Week_dates" rel="nofollow noreferrer">week dates</a>, specifically a Year-Week-Day such as <code>2009-W53-7</code> which is <em>Sunday 3 January 2010</em>.</p>
  
  <p>As for the year-week <em>without</em> the day-of-week:</p>
  
  <ul>
  <li><a href="https://stackoverflow.com/a/34846167/642706">My Answer</a> to the Question, <a href="https://stackoverflow.com/q/10278410/642706"><em>java get week of year for given a date</em></a>, explains using <a href="https://docs.oracle.com/javase/8/docs/api/java/time/temporal/IsoFields.html" rel="nofollow noreferrer"><code>IsoFields</code></a> to handle the year-week. </li>
  <li>The <a href="http://www.threeten.org/threeten-extra/" rel="nofollow noreferrer">ThreeTen-Extra</a> project that extends the java.time classes offers the <a href="http://www.threeten.org/threeten-extra/apidocs/org/threeten/extra/YearWeek.html" rel="nofollow noreferrer"><code>YearWeek</code></a> class. </li>
  </ul>
  
  <p>But how to represent the day-of-week as well? </p>