[tz] Fiji DST 2018/19

[Tim Parenti]

The third Tuesday in January falls between 1/15 and 1/21, so the Sunday
before would range from 1/13 to 1/19. With that, our guess of "Jan Sun>=13"
for the end of DST, one day before the start of School Term 1, seems
reasonable.

"Seven weeks earlier" than that, though, ranges from 11/25 to 12/1 the
previous year, which seems very wrong for the start of DST based on the
recent precedent of "Nov Sun>=1". It is likely the start of DST is not
specifically tied to the end of School Term 3.

--
Tim Parenti
sent from my Android phone

On Sun, 15 Jul 2018, 16:41 Brian Inglis, <Brian.Inglis at systematicsw.ab.ca>
wrote:

> 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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