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Giuntella & Mazzonna on health and economic costs of DST
by Paul Eggert April 20, 2019

April 20, 2019

A recently-published report by researchers from Pitt and USI found that daylight saving time reduces sleep duration by an average of 19 minutes in the US, and that this harms people's health and workers' wages. The researchers used CDC and US Census data to compare behavior on the western and eastern sides of time zone boundaries, and reported that individuals using daylight-saving time are 11% more likely to be overweight and 5.6% more likely to be obese. On average their wages are 3% lower. Effects are strongest on those with early work schedules. The researchers give the following bounds for the US annual economic costs of these effects: $2.35 billion ($82 per capita) for increased healthcare costs, and $612 million ($23 per capita) for worker productivity losses. These are lower bounds: actual costs are most likely higher. Costs are in 2017 dollars. Giuntella G, Mazzonna F. Sunset time and the economic effects of social jetlag; evidence from US time zone borders. J Health Econ. 2019. https://doi.org/10.1016/j.jhealeco.2019.03.007 (draft: https://pdfs.semanticscholar.org/3dd9/bf55292c1396a912b82c736ea3485dd5b884.…) A summary can be found in: Ingraham C. How living on the wrong side of a time zone can be hazardous to your health. Washington Post. 2019-04-19 06:00 -04. https://www.washingtonpost.com/business/2019/04/19/how-living-wrong-side-ti…

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Re: [tz] Will Morocco switch from +01 to +00 during Ramadan next year?
by Naoufal Semlali April 18, 2019

April 18, 2019

Hello, Please be informed that the Moroccan government has decided today to move back the clocks temporarily during Ramadan. Therefore, Morocco will be on GMT starting from Sunday, May 5th 2019 at 3am. The switch to GMT+1 will occur on Sunday, June 9th 2019 at 2am. Please find below the articles confirming this news. Source (French) : https://www.leconomiste.com/flash-infos/le-maroc-repassera-au-gmt-le-5-mai http://fr.le360.ma/societe/voici-la-date-du-retour-a-lheure-legale-au-maroc… https://www.lesiteinfo.com/maroc/officiel-le-maroc-repasse-a-lheure-gmt/ https://www.medias24.com/retour-a-l-heure-gmt-dimanche-5-mai-1616.html Regards, -------- Message d'origine -------- De : Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>> Date : 01/11/2018 06:21 (GMT+01:00) À : Paul Eggert <eggert(a)cs.ucla.edu<mailto:eggert@cs.ucla.edu>>, Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>>, Adlouni mehdi <adlounimehdi(a)gmail.com<mailto:adlounimehdi@gmail.com>>, Imad Bidaoui <imad.bida8(a)gmail.com<mailto:imad.bida8@gmail.com>>, Mohamed Essedik Najd <es.najd(a)gmail.com<mailto:es.najd@gmail.com>>, Milamber <milamberspace(a)gmail.com<mailto:milamberspace@gmail.com>>, Mounir EL MOKHTARI <momokhtari(a)gmail.com<mailto:momokhtari@gmail.com>> Objet : Re: Will Morocco switch from +01 to +00 during Ramadan next year? Hello Paul, The 2019 Ramadan period is supposed to be from May 5th to June 4th. We usually move clocks back the previous week end and come back to the +1 the week end after. So it supposed to be sunday april 28 and sunday june 12. The government does not announce yet the decision about this temporarily change. But it s 99% sure that it will be the case, as the previous years. A non official survey was done these days, showing that 64% of asked peopke are ok for moving from +1 to +0 during Ramadan. https://leconomiste.com/article/1035870-enquete-l-economiste-sunergia-64-de… I will share the official decision once it s published. Regards, Abdelkader Maamar -------- Message d'origine -------- De : Paul Eggert <eggert(a)cs.ucla.edu<mailto:eggert@cs.ucla.edu>> Date : 01/11/2018 05:23 (GMT+01:00) À : Maamar Abdelkader <A.MAAMAR(a)iam.ma<mailto:A.MAAMAR@iam.ma>>, Adlouni mehdi <adlounimehdi(a)gmail.com<mailto:adlounimehdi@gmail.com>>, Imad Bidaoui <imad.bida8(a)gmail.com<mailto:imad.bida8@gmail.com>>, Mohamed Essedik Najd <es.najd(a)gmail.com<mailto:es.najd@gmail.com>>, Milamber <milamberspace(a)gmail.com<mailto:milamberspace@gmail.com>>, Mounir EL MOKHTARI <momokhtari(a)gmail.com<mailto:momokhtari@gmail.com>> Objet : Will Morocco switch from +01 to +00 during Ramadan next year? If you have information about whether Morocco will move clocks back temporarily during Ramadan next year, please write to me or to tz(a)iana.org<mailto:tz@iana.org>. Thanks. I wrote more about this question here: https://mm.icann.org/pipermail/tz/2018-November/027146.html ________________________________ [Description : cid:image002.jpg@01CC9EE4.44A57D10]Eco - geste: privilégiez la sauvegarde électronique, si nécessaire imprimez en recto-verso ________________________________ Ce message et toutes les pièces jointes sont adressés à l'attention exclusive de leurs destinataires et sont strictement confidentiels. Si vous le recevez par erreur, merci de le détruire après en avoir informé l'expéditeur sans délai. Toute divulgation, copie ou usage par une personne autre que son destinataire sont interdits. Maroc Telecom décline toute responsabilité pour toute altération, déformation ou falsification subie par le message au cours de sa transmission. Retrouvez toutes les informations de Maroc Telecom sur www.iam.ma<http://www.iam.ma> . ________________________________ This message and its attachments are intended only for the person or entity to which it is addressed and are strictly confidential. If you have received this in error, please delete the material from any computer after having informed the sender. Any copy or other use of this information by persons or entities other than the intended recipient is prohibited. Maroc Telecom accepts no liability for any alteration, distortion or falsification that may occur during the transmission of this message. All information about Maroc Telecom on www.iam.ma .

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question around santiago tz, and sync tz
by gerar.moisset＠orange.com April 16, 2019

April 16, 2019

Hello. We have upgraded and use now tzdata2019a data from iana. We have new customer using our service (java service updated with tzupdater) with tz in Santiago. If I check Santiago time zone I see: (GMT-04:00) America/Santiago [hasDST:false] #seems to be good since tzdata2019a (GMT-04:00) America/Santiago - Summer Time [hasDST:true] #not good since 7 avr 2019 - Daylight Saving Time Ended My question is: If I check timeanddate for Santiago on: https://www.timeanddate.com/worldclock/chile/santiago I can see : DST for Santiago start on 8 sep 2019 What will be the new values for this tz? Will its included into next tz iana update? And when? where can i find little tutorial around this? I need to automatically synchronize our platform, what will be the best way for us from your internet access? Kind regards. Gérard Moisset Orange/TGI/OLS/BIZZ/UCEM/WUC Spécialiste en Technologies Plate-Formes Services +33 5 34 54 40 77 <http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/ToolBar.do?action=default%26…> +33 6 80 45 05 71 <http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/ToolBar.do?action=default%26…> gerar.moisset(a)orange.com <mailto:gerar.moisset@orange.com> me joindre d'un clic ! [http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/images/telephone.gif]<http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/ToolBar.do?action=default%26…> [http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/images/mobile.gif] <http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/ToolBar.do?action=default%26…> [call : gerar.moisset(a)orange.com] <callto:%3Csip:gerar.moisset@orange.com%3E> [http://clicvoice.sso.infra.ftgroup/ClicvoiceV2/images/sms.gif] <https://monsi.sso.francetelecom.fr/index.asp?target=http://smsnet.sso.franc…> [Email : gerar.moisset(a)orange.com] <mailto:gerar.moisset@orange.com> _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you.

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GPS Week Number Rollover Apr 6/7
by Chris Woodbury April 12, 2019

April 12, 2019

The airlines' software problems are most likely with Notices to Airman (NOTAMs). These are public domain data and announcements of airspace restrictions, etc. which AeroData, Inc. has been contracted by the FAA to provide since 1990. It looks like they do it for the EU, too. These announcements are part of the suite of software that AeroData provides. Every media outlet is mentioning weight and balance (read fuel load and cargo balancing for aircraft before take off) and completely missing the part that does airspace restriction, route and waypoint calculations that will certainly involve GPS information. Ya' gotta love the media...

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Chile Continental Time changed to standard time April 6
by Gardner, Stephanie (Enel X) April 11, 2019

April 11, 2019

Hello, I've just joined this mailing list and I don't fully understand how this works, but I'm writing because have a dilemma. My understanding is that Chile Continental time changed back to standard time on April 6. See https://www.horaoficial.cl/aviso/informacion.html which states: "Dispone fecha cambio huso horario para el 6 de abril de 2019, de acuerdo a lo siguiente: a. Chile Continental (desde Región de Arica y Parinacota hasta Aysén), a las 24:00 hora local, pasará a huso horario UTC-4, y deberá atrasar los relojes en una hora." However, this is not reflected in the 2019-03-25 release. I therefore have an application which is using the incorrect UTC offset as a result. What is the process for getting that change into the database? Thanks, Stephanie Gardner Product Manager Enel X North America, Inc. www.enelx.com/northamerica

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Am I missing an implicit rule?
by Grilled Chipolatas April 11, 2019

April 11, 2019

Hello, I have been working with the database lately and have had issues to read Morocco rules. I tried to look in the archives of the mailing list but didn't find my answer. Currently the database contains these bits: Rule Morocco 2017 only - Jul 2 2:00 1:00 - Rule Morocco 2018 only - May 13 3:00 0 - Rule Morocco 2018 only - Jun 17 2:00 1:00 - Rule Morocco 2019 only - May 5 3:00 -1:00 - Rule Morocco 2019 only - Jun 9 2:00 0 - # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Africa/Casablanca -0:30:20 - LMT 1913 Oct 26 0:00 Morocco +00/+01 1984 Mar 16 1:00 - +01 1986 0:00 Morocco +00/+01 2018 Oct 28 3:00 1:00 Morocco +01/+00 I wonder if the database should add this rule dated to the switching to permanent DST: Rule Morocco 2018 only - Oct 28 3:00 0 - Or am I missing an implicit rule: being that a new zone change discard any current rule (here Morocco 2018 only - Jun 17 2:00 1:00 - )? Thanks for any clarification, Maxime Vinzio

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Re: [tz] DST in Palestine will start one week later
by Grace D'Alfonso April 11, 2019

April 11, 2019

Your discussion on Palestine’s DST has not touched on the fact that there are two different time zones for Palestine: (1) Asia/Gaza (covering the Gaza Strip) and (2) Asia/Hebron (covering the West Bank). Does your recent discussion relate to both time zones or to one specific time zone? For your information, timeanddate.com is showing different DST change dates for each regions However, it seems to have the wrong information for the city of Nablus (at least). The Palestine Exchange is located in Nablus and it clearly changed time today (29 March) according to its website: http://www.pex.ps/PSEWebSite/English/Default.aspx, while timeanddate.com indicates that it changed on 23 March. Thanks for any help you can provide in clarifying the time zone for this very confusing region! Regards, Grace D'Alfonso Copp Clark Limited Toronto, ON Canada Tel. +1-647-382-4262 www.coppclark.com www.marketholidays.com www.goodbusinessday.com Copp Clark is the authoritative source for information on holiday observances affecting world financial markets. Our trading hours, early closing and holiday reference data are trusted and recognized globally as the market standard.

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Brazil might end DST
by Steffen Thorsen April 7, 2019

April 7, 2019

According to multiple sources the Brazilian president wants to get rid of DST. https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-… https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-hor… https://republicadecuritiba.net/2019/04/05/bolsonaro-afirma-que-brasil-nao-… There might be some formalities still, but given these articles it seems very likely that they actually will stop changing clocks. Best regards, Steffen Thorsen - timeanddate.com

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Issue in tz America/Santiago
by Alberto Jose Rivera Rojas April 4, 2019

April 4, 2019

Before install the time change patch tzdata2019a the date command delivers the next output Thu Apr 4 11:07:36 CLST 2019 After installing the time change patch tzdata2019a the date command delivers the next output Thu Apr 4 11:07:36 -03 2019 we modified the lines 1278 changing -3 for CLST and -4 CLT. attachment Zone America/Santiago -4:42:46 - LMT 1890 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time -5:00 - CLT 1916 Jul 1 # Chile Time -4:42:46 - SMT 1918 Sep 10 -4:00 - CLT 1919 Jul 1 -4:42:46 - SMT 1927 Sep 1 -5:00 Chile CL%sT 1932 Sep 1 -4:00 - CLT 1942 Jun 1 -5:00 - CLT 1942 Aug 1 -4:00 - CLT 1946 Jul 15 -4:00 1:00 CLST 1946 Sep 1 # central Chile -4:00 - CLT 1947 Apr 1 -5:00 - CLT 1947 May 21 23:00 -4:00 Chile CL%sT -- Atte. Alberto Rivera. +56944771319

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GPS Week Number Rollover Apr 6/7
by Brian Inglis April 2, 2019

April 2, 2019

Expect some amount of time related disruption around April 7 00:00 GPS as the GPS 1K week cycle rolls over and GPS receivers that have not been patched or updated to use new CNAV and MNAV messages, or compensate for not doing so, provide incorrect time, position, and navigation solutions. Garmin, for example, rolled out updated firmware for some of their receivers, including the 18x popular on NTP servers, just over a week ago. Previous rollovers have shown symptoms of clocks being out by multiples of 256 weeks, some resetting to the GPS epoch at 1980 Jan 06 Sun 00:00:00+0000, showing misleading position and navigation solutions, depending on what inputs are used to solve the 4D simultaneous equations. Airlines, ships, and well maintained commercial trucks shouldn't crash, but the rest of us should check any devices using GPS! If my script is correct, the rollover occurs at the indicated instant on the time scales below: 2019 Apr 06 Sat 23:59:42+0000 JD 2458580.499792 MJD 58579.999792 ToD 86382 NTP 3763583982 Unix 1554595182 GPS We 2048 Cy 2 Wn 0 Wa 0 ToW 0 DoW 0 ToD 0 TAI-UTC 37 TAI-GPS 19 GPS-UTC 18 [*NOT* an April Fools post, unfortunately!] -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised.

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