code: public Date getDataAttrAsDate(String dPath, String dateTimeFormat) {
          Lock lock = lockForRead();
          try {
              return DPathUtils.getDate(dataJson, dPath, dateTimeFormat);
          } finally {
              lock.unlock();
          }
      }
docs: Get a "data"'s sub-attribute as date. If the attribute value is a string,
  parse it as a {@link Date} using the specified date-time format.
  
  @param dPath
  @param dateTimeFormat
  @return