title: How to Format Hijri Date
body: <p>I'm using <strong>time4A</strong> to do transformation from <code>Islamic Hjiri to Gregorian Date</code> and vice versa. I'm not able to find a way to format <strong>Hijri Date</strong> to "<code>yyyy/mmm/dd</code>" pattern.</p>
  
  <p>Here is the code to convert from <strong>Gregorian to Hijri</strong> : </p>
  
  <pre><code>     CalendarVariant variant =
                      PlainDate.of(2016, 02, 12)
                              .transform(HijriCalendar.class, HijriCalendar.VARIANT_UMALQURA);
  
  System.out.println(variant.toString());
  </code></pre>
  
  <p>I got this <code>AH-1437-05-03[islamique-umalqura]</code></p>
  
  <p>I need some thing like: <code>1437-05-03</code></p>
  
  <p>So, How I can format <strong>Hijri Date</strong> ?</p>