h a call has the side effect of setting the value
   associated with SYSTEM to a blank.

</pre><h4><a name="Required Reading">Required Reading</a></h4><pre>

   For important details concerning this module's function, please refer to
   the CSPICE routine <a href="../cspice/timdef_c.html">timdef_c</a>.

   <a href="../req/mice.html">MICE.REQ</a>
   TIMDEF.REQ

</pre><h4><a name="Version">Version</a></h4><pre>

   -Mice Version 1.0.1, 13-FEB-2015, EDW (JPL)

       Edited I/O section to conform to NAIF stand