Hi Paul, There is a DST time change in Fiji island from November 4th. http://www.fijitimes.com/government-approves-2018-daylight-saving/ The attached order states: Members of the public are advised to move their clocks one hour ahead at 2am on Sunday November 4. The daylight saving period will end at 3am on Sunday January 13, 2019. Fiji rules in tzdata2018e.tar.gz: There is a need to change the NON DST time from 14th Jan to 13th Jan. Can a new tzdata be generated for Fiji Islands. Rule Fiji 2014 max - Nov Sun>=1 2:00 1:00 - Rule Fiji 2015 max - Jan Sun>=14 3:00 0 - Thanks, Raymond Kumar Head of Billing & Products +679-7015315 ________________________________ Notice of Confidentiality: The information contained in this communication is intended solely for the use of the individual or entity to whom it is addressed and others authorized to receive it. It may contain confidential or legally privileged information. If you are not the intended recipient you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by responding to this email and then delete it from your system.
Thanks for the heads-up. Proposed patch attached. Do you have any idea whether Fiji is using a systematic rule for end of DST? Our guesses seem to be wrong a lot.
Hi Paul End of DST in Fiji is based on School Start Terms. In 2019 school term in Fiji starts from 14th Jan, so DST ends on 13th. In 2018 school term started on 15th Jan, so DST was changed on 14th Jan If a generic patch can be created from 7th Jan, then this can be catered for future DST end time, as school term always ends after week of 7th Jan. Thanks, Raymond Kumar Head of Billing & Products +679-7015315 -----Original Message----- From: Paul Eggert [mailto:eggert@cs.ucla.edu] Sent: Friday, July 13, 2018 4:35 PM To: Raymond Kumar <Raymond.Kumar@digicelgroup.com>; Time zone mailing list <tz@iana.org> Cc: Products Pacific <Products_Pacific@digicelgroup.com>; Mudassar Latif <Mudassar.Latif@digicelgroup.com>; Vishal Vineet Kumar <VishalVineet.Kumar@digicelgroup.com> Subject: [EXTERNAL] Re: Fiji DST 2018/19 Thanks for the heads-up. Proposed patch attached. Do you have any idea whether Fiji is using a systematic rule for end of DST? Our guesses seem to be wrong a lot. ________________________________ Notice of Confidentiality: The information contained in this communication is intended solely for the use of the individual or entity to whom it is addressed and others authorized to receive it. It may contain confidential or legally privileged information. If you are not the intended recipient you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by responding to this email and then delete it from your system.
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
Typo in the patch to NEWS; further proposed patch attached. 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. -- Tim Parenti On 13 July 2018 at 11:13, Paul Eggert <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
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. If anyone wants to play with the school term dates for years documented on the site, they may be able to come up with a consistent relation to ISO weeks, that should also be consistent with the DST dates. Even if true, for a single case, it's unlikely anyone will extend the tz date notation to support ISO week/day date relations, as that might encourage those countries who use them widely to define *their* DST periods as ISO weeks, and that could spread, as administrators buy calendars marked with ISO weeks ;^>
-- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
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
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
Tim Parenti wrote:
Typo in the patch to NEWS; further proposed patch attached.
Thanks, I installed that.
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.
Good idea, I installed the attached too.
On 2018-07-12 22:34, Paul Eggert wrote:
Thanks for the heads-up. Proposed patch attached. Do you have any idea whether Fiji is using a systematic rule for end of DST? Our guesses seem to be wrong a lot.
Officially: http://www.fiji.gov.fj/Media-Center/Press-Releases/GOVERNMENT-APPROVES-2018-... http://www.fiji.gov.fj/getattachment/ac11e09c-a2f3-4bdf-9ea1-5d0138020fda/LN... Previously: http://www.fiji.gov.fj/getattachment/f673c425-f6af-4dfc-a148-ba18614ae489/LN... 2016: http://www.fiji.gov.fj/Media-Center/Press-Releases/DAYLIGHT-SAVING-TO-END-ON... Nothing found for 2015, although prior years were available: in those years DST ended as late as Jan 20th and 21st. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
participants (4)
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Brian Inglis -
Paul Eggert -
Raymond Kumar -
Tim Parenti