title: Convert Calendar instance to DateTime() in java
body: <p>How can I convert a calendar instance to a Datetime instance in java without any new libraries. I have searched all over the net for this and am stuck. </p>
  
  <p>The code below requires Datetime() instance to get the arabic month, the variable I would like to use/convert is a calendar instance. </p>
  
  <pre><code>DateTime_now = new DateTime(); 
  DateTime_now.withChronology(IslamicChronology.getInstance(tzSAUDI_ARABIA, IslamicChronology.LEAP_YEAR_15_BASED)).getMonthOfYear()
  </code></pre>