ISDSDATE(<C date string>)
 Evaluates whether a date string is valid.
 Returns <expL> true if <date string> is valid in format and contents.

 <date string> is in the format "YYYYMMDD".

 * Validate user-entry date string
 m_datestr = SPACE(8)
 @...SAY "Enter date as YYYYMMDD string:";
     GET m_datestr PICTURE "########";
     VALID ISDSDATE(m_datestr)


             Placed in the Public Domain by Tom Rettig Assoc.