Re: [calsify] JSCalendar: fractional seconds

Is this parameter is meant to preserve the fractional seconds for
round-trips or are iCalendar clients encouraged to use the value?

I mean, would a client that's aware of X-FRACSEC have to match
RECURRENCE-IDs ,RDATES and EXDATES taking the fractional seconds into
account?

I think we should advise against that and make clear that this is not
meant to increase the precision of times in iCalendar, but merely to
preserve it.

Btw, how do we cope with unaware clients doing partial updates? I.e. a
client which is not aware of X-FRACSEC adds a new recurrence-override
(not adding X-FRACSEC to RECURRENCE-ID). When being converted back to
JSCalendar, this would result in an additional instance instead of an
override.

Marten

Am 06.06.19 um 13:49 schrieb Robert Stepanek:
> It just occurred to me that the current JSCalendar RFC draft
> ambiguously defines if fractional seconds are allowed in the LocalDate
> time type.
>
> To be clear: we intend to allow fractional seconds in the start
> property (and any other LocalDate property). The next version of the
> RFC draft will define this more clearly.
>
> Unfortunately, fractional second date-times and durations can not be
> round-tripped out of the box with iCalendar. We will define an
> iCalendar extension parameter in the informational guide for mapping
> iCalendar and JSCalendar (draft-ietf-calext-jscalendar-icalendar):
>
>   * X-FRACSEC of value type INTEGER
>   * This parameter MAY be set on iCalendar properties of type
>     DATE-TIME or DURATION. It MUST NOT be set more than once per property.
>   * The value of this parameter defines the fractional seconds of the
>     DATE-TIME or DURATION type.
>   * This will allow iCalendar implementations  not being aware of this
>     extension parameter to display the time value "good enough" with
>     second precision.
>
>
> Please let me know if you prefer another approach.
>
> Cheers,
> Robert
>
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