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PODjango - Oracle backend error
 

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    <p>I have the following model in Django:</p> <pre><code>class Event(models.Model): # some fields start_date = models.DateField() end_date = models.DateField() </code></pre> <p>I'm using Oracle 10g Database with Django 1.5 and cx_oracle 5.1.2. The issue here is when I try to create a new object in the admin interface (picking dates from the calendar), the following error is raised:</p> <pre><code>ORA-01843: not a valid month </code></pre> <p><code>syncdb</code> has created a <code>DATE</code> field in oracle for <code>start_date</code> and <code>end_date</code>. Does this look like a backend bug or am I doing something wrong?</p> <p>I do have other models with <code>DateTimeField()</code> and they work fine when I persist new objects, the issue looks related to <code>DateField</code> itself.</p> <p><strong>UPDATE:</strong> I have checked the backend implementation, and in <code>backends/oracle/base.py</code> lines 513 to 516:</p> <pre><code>cursor.execute( "ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'" " NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'" + (" TIME_ZONE = 'UTC'" if settings.USE_TZ else '')) </code></pre> <p>Executing this statement allows an insert statement to have literal values for <code>DATE</code> fields. I have checked the query generated by the backend and it is inserting <code>'2013-03-20'</code> in <code>start_date</code> and <code>end_date</code>. The date matches <code>NLS_DATE_FORMAT</code>, so this in theory should work!</p> <p><strong>UPDATE</strong>: I believe my case is <a href="https://stackoverflow.com/questions/15396241/cx-oracle-ora-01843-not-a-valid-month-with-unicode-parameter">related to cx_oracle</a>.</p> <p><strong>UPDATE</strong>: Since I still don't have a definite answer (although I'm almost sure it's cx_oracle that's causing this issue), I changed my <code>DateField</code> into a <code>DateTimeField</code> which translates into oracle's <code>TIMESTAMP</code> and works perfectly fine.</p>
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    1. COSo just to be clear, you're checking the Oracle SYS tables for the SQL being run and seeing something like `TO_DATE('2013-03-20', 'YYYY-MM-DD')` in your insert? From your question, it looks like `NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'`, which is different from the actual insert, though I don't know what effect this would have in this context.
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    2. CONo, because of the alter session statement setting `NLS_DATE_FORMAT`, you can insert the date as a literal without to_date, which is the case when I check the SQL being executed.
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    3. COCan you post the relevant SQL that is being run on the server that results in the `ORA-01843` error?
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