title: Sql loader date format not recognized
body: <p>I have in my application a sql loader , which inserts some dates  and other data 
  in the database . In simplified version, the following :</p>
  
  <pre><code>INTO TABLE DONNEES
  FIELDS TERMINATED BY ';'
  TRAILING NULLCOLS 
  (ID NUMBER
  ,DAT_FR date "YYYY/MM/DD"
  ,DAT date "to_date('01'||to_char(:DAT_FR,'MMYYYY'),'DDMMYYYY')"
  </code></pre>
  
  <p>DAT_FR is correct, but I have an error for DAT. For exemple, if DAT_FR equals 2016/07/14, I want DAT "equals" in my database 2016/07/01 (first day of the month).</p>
  
  <p>The error is : "ORA-01821: date format not recognized"</p>
  
  <p>Could you help me ?</p>
  
  <p>Sample input :</p>
  
  <pre><code>1;2016/05/31
  2;2016/06/14
  </code></pre>