title: Converting a birthdate to its lunar year equivalent
body: <p>Is it possible to figure out someones lunar birth day given that you know the regular (gregorian) day?</p>
  
  <p>There is an example on the joda time website that shows:</p>
  
  <pre><code>// setup date object for midday on May Day 2004 (ISO year 2004)
  DateTime dtISO = new DateTime(2004, 5, 1, 12, 0, 0, 0);
  
  // find out what the same instant is using the Islamic Chronology
  DateTime dtIslamic = dtISO.withChronology(IslamicChronology.getInstance());
  </code></pre>
  
  <p>Is this ISO year representing the gregorian representation?</p>