def ISO8601():
    """Return the object in ISO 8601-compatible format containing
        the date, time with seconds-precision and the time zone
        identifier - see http://www.w3.org/TR/NOTE-datetime

        Dates are output as: YYYY-MM-DDTHH:MM:SSTZD
            T is a literal character.
            TZD is Time Zone Designator, format +HH:MM or -HH:MM

        The HTML4 method below offers the same formatting, but
        converts to UTC before returning the value and sets the TZD"Z"
        """
