private val d =
    DateTimeFormatterBuilder()
      .appendValue(HOUR_OF_DAY, 2)
      .appendLiteral(':')
      .appendValue(MINUTE_OF_HOUR, 2)
      .optionalStart()
      .appendLiteral(':')
      .appendValue(SECOND_OF_MINUTE, 2)
      .optionalStart()
      .appendFraction(NANO_OF_SECOND, 3, 3, true)
      .toFormatter()

  private val offset = ZoneOffset.systemDefault()