[tz] Fiji DST 2018/19

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sun Jul 15 20:41:19 UTC 2018

On 2018-07-15 11:36, Brian Inglis wrote:
> On 2018-07-15 09:27, Tim Parenti wrote:
>> On 13 July 2018 at 11:13, Paul Eggert <eggert at cs.ucla.edu
>> <mailto:eggert at cs.ucla.edu>> wrote:
>>> On 07/12/2018 11:53 PM, Raymond Kumar wrote:
>>>> school term always ends after week of 7th Jan.
>>> In 2018 the Fiji school term started January 15, which was the first Monday
>>> after the week containing January 7. However, in 2017 the school term
>>> started January 16, even though January 9 was the first Monday after the
>>> week containing January 7. So I'm afraid that I'm not seeing the pattern
>>> here.
>>>     http://www.fiji.gov.fj/Events/2016-SCHOOL-TERMS.aspx
>>>     http://www.education.gov.fj/index.php/30-home/327-school-terms-2017
>> Even if we don't have a discernible pattern for when the Fijian school term 
>> starts, we should probably add some commentary that their January transition
>> out of DST tends to be based on it, as it points us to several other sources
>> from which we could derive better guesses.
> The pattern appears to be in ISO/"work" weeks 14, 2 hols, 14, 2 hols, 13/14, 7/8
> hols/DST, to align the weeks with the years, like an ISO work year shifted a
> fortnight later.

It looks, from online info available on school years 2015-2019, like Fiji DST
should end on the Sunday before the third Tuesday (Sunday, Monday, and Thursday
based weeks don't match) giving Jan Sun > 12 (same as updated rule Jan Sun>=13)
and begins 7 weeks earlier.
Weeks/year increments currently appear to increase the third school term from 13
to 14 weeks, rather than increasing the summer holidays from 7 to 8 weeks.

So while there is a rule for the start of DST, I don't think it can be eternally
encoded in the tzdb, but could be calculated and current rules adjusted for
differing years.

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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