code: @CheckForNull
    public static Date parseDateTimeQuietly(@Nullable String s) {
      Date datetime = null;
      if (s != null) {
        try {
          datetime = parseDateTime(s);
        } catch (RuntimeException e) {
          // ignore
        }
  
      }
      return datetime;
    }
docs: Parse format {@link #DATETIME_FORMAT}. This method never throws exception.
  
  @param s any string
  @return the datetime, {@code null} if parsing error or if parameter is {@code null}