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    <p>IBM defines *JUL date format as <em>yy/ddd</em>. It is not commonly used, but is is an available standard format supported on the AS/400. You say you have a string, so the assumption here is that it is stored as CHAR(5), or 5A in DDS.</p> <p>If you column is called <em>jdt</em>, get the right number of digits in your string, in SQL, with: </p> <pre><code> RIGHT(('00000' || TRIM(jdt)),5) </code></pre> <p>Now put the slash in:</p> <pre><code> INSERT( RIGHT(('00000'||TRIM(jdt)),5) ,3,0,'/') </code></pre> <p>DB2/400 can cast this to a real date field, but it will only work properly if you can <code>SET OPTION DATFMT=*JUL</code>. How to do this from C# on Windows would depend on how you are connecting. </p> <p>Let's suppose you can't find the way to set the date format on your connection.</p> <p><strong>Solution:</strong> Create a user defined function [UDF] in DB2. </p> <p>First, choose an appropriate library to store the function in, and set that as your current library. In OS/400 CL, <code>CHGCURLIB yourlib</code>, or in SQL, <code>SET SCHEMA = yourlib</code>. Thus by default anything you create will go into this library. </p> <p>I recommend storing the SQL definition for your UDF in a source member. (Ask if unfamiliar) You can execute the source with the <code>RUNSQLSTM</code> command.</p> <p>Your function definition could look something like this:</p> <pre><code>CREATE FUNCTION CvtJul2Date( jdtin char(5) ) RETURNS DATE LANGUAGE SQL SPECIFIC CVTJUL2DT DETERMINISTIC NO EXTERNAL ACTION CONTAINS SQL RETURNS NULL ON NULL INPUT SET OPTION DATFMT = *JUL BEGIN RETURN( date( insert( right(('00000'||trim(jdtin)),5) ,3,0,'/') ) ); END </code></pre> <p>The *JUL option is scoped to the UDF. Any SQL query that runs on the AS/400 should be able to do this conversion, regardless of the DATFMT of the job (assuming you have put this function in a library which is on that job's library list).</p>
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