code: @Nonnull
    public static String getLocalDateTimeForFilename (@Nonnull final LocalDateTime aDT)
    {
      return PDTToString.getAsString (PATTERN_DATETIME, aDT);
    }
docs: Get the passed local date time formatted suitable for a file name.
  
  @param aDT
  The local date time to be formatted. May not be <code>null</code>.
  @return The formatted string.