1842   Chile and Fiji time change configuration

Created: 08 Sep 2022

Status: Future Improvement

Part: Part 7-3 (2020; Edition 2.1)


Page: 25

Clause: 6.10 Calendar time definition (CalendarTime)

Paragraph: Figure 4 and Table 9


As Calendar Time is currently defined in clause 6.10 of part 7-3, we don't consider it possible to configure the time change for Chile and Fiji.
The rules for such time changes are defined at https://data.iana.org/time-zones/releases/tzdata2022c.tar.gz as follows:

Rule Fiji 2022 max - Nov Sun>=8 2:00 1:00 -
Rule Fiji 2023 max - Jan Sun>=12 3:00 0 -

Rule Chile 2019 max - Apr Sun>=2 3:00u 0 -
Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 -

In other regions the change is on the Sunday after or equal to day 1, 8, 15 or 22 and in these cases there is no problem as it can be configured with occPer Year, occType WeekDay and occ 1, 2, 3 or 4 respectively. However, when the change is on Sunday after or equal to day 2 or day 12 we do not see any possible way to configure it.


We propose to modify the definition of Calendar Time to be able to configure these cases.
For example, a new occType WeekDayGE could be added for the case "day of the week" after or equal to X day. This new occType would be configured with occPer Year and the parameters <weekDay>, <month>, <day>, <hr>, <mn> every year.

Discussion Created Status
Approved 22 Nov 22 Future Improvement
Set to future improvement as proposed on Oct, 11 22 Nov 22 Approval (Future Improvement)
Propose to set to future improvement.
For such changing rules, we recommend to change the start and end of Daylight Changing every year to match to new established rule.
11 Oct 22 Triage


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