title: Encountering SQL Error: ORA-01843: not a valid month
body: <p>I created a table using this query <br>
  <code>CREATE TABLE Store (id number(11) primary key not null, opening_time timestamp CHECK (EXTRACT(HOUR FROM opening_time) &gt; 8 || NULL));</code>
  <br><br>
  Now, when I try to insert some data using <code>insert into Store values(1, '04/04/2012 13:35 PM');</code>, I encounter this error <code>SQL Error: ORA-01843: not a valid month</code>.
  <br><br>
  What is it that I am doing wrong ?</p>