[tz] Recommendations to governments about time zone update notice period and format
Brian.Inglis at Shaw.ca
Wed Mar 8 15:27:17 UTC 2023
On 2023-03-08 00:55, Paul Eggert via tz wrote:
> On 2023-03-06 03:41, Neil Fuller via tz wrote:
>> [*] e.g. maybe something like "Many downstream users of the TZDB wait ...
> Thanks for the suggested wording. I folded it into a new section in
> tz-link.html, with the title "Coordinating with governments and distributors",
> by installing the attached proposed patch. Once it's released (which should be
> soon, for Egypt) we can cite this URL:
> Further comments welcome of course.
+Many downstream timezone data distributors wait for
+a <code><abbr>tzdb</abbr></code> release before they produce an update
Prefix "official" before "release" and suffix something like "announced on the
official tz-announce mailing list, see:
for details, to subscribe, or view the archives:
Are no current or latest month archive links supported as on some lists?
> Brian suggested something more ambitious (and more laborious...).
They have the greater needs, presuambly documented and scheduled processes, and
the funding to coordinate more comprehensive and expansive documents, explaining
their needs, processes, and time frames.
> I sometimes wonder how the IATA's process works for updating the SSIM's time
> zone appendix. Since they charge $1000/year for the SSIM I've never used it
Can't even read the procedure without paying the fee!
For background see:
"IATA schedules conferences
Schedules Conferences are held twice each year (June and November) about five
months before the start of the respective schedules seasons and are organised by
Slot handback deadline
Unwanted slots must be returned no later than January 15 for the next Northern
Summer season and no later than August 15 for the next Northern Winter season."
There are also notice periods like notification of cancellation three weeks
prior to operation of a scheduled slot.
Presumably on a short notice time change, the slots in UTC are bumped in local
time, to avoid disrupting schedules, and it is presumably then up to commercial
airlines to apply for exemptions and make provisions for Justified Non-Use of
Slots (“JNUS”) if they lack demand, ATC, airline, or airport personnel to
operate commercial scheduled flights at those slot times, or negotiate with
other carriers/operators for slot exchanges.
Of course there may be national, airport, or airline regulations that mandate
operation for political reasons or to maintain slots (e.g. EU 80%).
Those with experience of IATA schedules, airline/airport operation, or travel
industry can correct any presumptions.
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
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