nd a pointer to a variable of type date that should
        hold the result of the operation.
       </p><p>
        Currently the function returns always 0.
       </p><p>
        Internally the function is implemented to use the function <a class="xref" href="ecpg-pgtypes.html#PGTYPESDATEMDYJUL"><code class="function">PGTYPESdate_mdyjul</code></a>.
       </p></dd><dt id="ECPG-INFORMIX-FUNCTIONS-RDAYOFWEEK"><span class="term"><code class="function">rdayofweek</code></span> <a href="#ECPG-INFORMIX-FUNCTION