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@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@cs.ucla.edu <mailto:eggert@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