* Get <code>DateFormat</code> object.
*/
public SimpleDateFormat getDateFormat(final String str) throws FtpException {
String value = getProperty(str);
if (value == null) {
throw new FtpException(str + " not found");
}
try {
return new SimpleDateFormat(value);
} catch(IllegalArgumentException e) {
throw new FtpException("Date format was incorrect: " + value, e);
}
}