visad/src/main/java/ucar/nc2/iosp/gempak/AbstractGempakStationFileReader.java
private List<Key> getDateTimeKeys() {
    Key date = findKey(DATE);
    Key time = findKey(TIME);
    if ((date == null) || (time == null)
            || !date.type.equals(time.type)) {
      return null;
    }
    List<Key> dt = new ArrayList<>(2);
    dt.add(date);
    dt.add(time);
    return dt;
  }
private List<Key> getDateTimeKeys() {
    Key date = findKey(DATE);
    Key time = findKey(TIME);
    if ((date == null) || (time == null)
            || !date.type.equals(time.type)) {
      return null;
    }
    List<Key> dt = new ArrayList<>(2);
    dt.add(date);
    dt.add(time);
    return dt;
  }
Get the date/time information

@return the list of date/time keys