July 2019 - tz - lists.iana.org

Re: [tz] zone America/Indiana/Tell_city 1967 - 1969
by Paul Eggert July 11, 2019

July 11, 2019

Michael H Deckers wrote: > -Rule Perry 1960 only - Oct lastSun 2:00 0 S Thanks for catching that typo; I installed the attached.

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USNO steps gingerly into the daylight saving mess
by Paul Eggert July 10, 2019

July 10, 2019

Last month the US Naval Observatory's Astronomical Applications Department published a web page that displays daylight saving starting and ending dates for US rules since 1967. A web page lets you enter a year like 1967 and the response will tell you start and end dates for that year. There is also an API that returns the data in a JSON format. Only US federal rules are supported, and only years from 1967 through 9999. See: https://aa.usno.navy.mil/data/docs/daylight_time.php

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zone America/Indiana/Tell_city 1967 - 1969
by Alois Treindl July 10, 2019

July 10, 2019

I am afraid I have to challenge the entry Zone America/Indiana/Tell_City -5:47:03 - LMT 1883 Nov 18 12:12:57 -6:00 US C%sT 1946 -6:00 Perry C%sT 1964 Apr 26 2:00 -5:00 - EST 1969 -5:00 US E%sT 1971 -5:00 - EST 2006 Apr 2 2:00 -6:00 US C%sT It conflicts with Shanks for 1967-169, and therefore I checked newspaper archives. The Indianapolis News, Friday 27 October 1967 states that Perry County returned to CST. It went again to EST on 27 April 1969, as documented by the Indianapolis star of Saturday 26 April. (second screenshot attached)

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VTIMEZONEs and Outlook
by Ken Murchison July 10, 2019

July 10, 2019

All, Sorry for the off-topic post, but I'm fishing. I'm one of the maintainers of vzic, a utility to convert IANA tzdata into iCalendar VTIMEZONE components. In the process of tweaking the tool to handle recent tzdata changes and to generate more correct/compact VTIMEZONEs in "pure" mode, I managed to break the generation of Outlook-compatible VTIMEZONEs. Does anyone know what parts of the iCalendar/VTIMEZONE spec that Outlook doesn't properly handle and/or know what the requirements are to be compatible with Outlook? -- Ken Murchison Cyrus Development Team Fastmail US LLC

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Blocked USNO sites was: Updated Public Domain leapseconds.list
by Chris Woodbury July 8, 2019

July 8, 2019

>On Mon Jul 8 11:16:42 UTC 2019,Tony Finch dot at dotat.at wrote: > >The main problem that I can see is 3 out of the 7 navy.mil DNS servers say >that usno.navy.mil does not exist, so it's a matter of luck whether you'll >be able to contact it or not. > >Tony. Great detective work, Tony! After a little "digging" of my own, I discovered it's even worse than that. There are no public facing "authoritative" DNS servers for Navy.MIL (or USNO.Navy.MIL as all of them are unreachable). The Navy.MIL DNS servers have *no authoritative data* for USNO; they all appear to be caching secondary servers. The give away is that the TTLs decrements between "dig" runs. (Possibly "slit horizon" DNS servers that internally referencing their other half. There's no way to tell from this side.) This also means that the primary server listed in the SOA is not the real primary. There must be hidden primary and secondary DNS server somewhere as the servers we can actually see have cached RR (resource records). Someone hasn't thought out all of the implications of what they're doing. When I was looking, only two of seven Navy.MIL DNS servers returning NXDOMAIN for USNO.Navy.MIL. These were ns1.csd.disa.mil, the purported Navy.MIL primary DNS server (with no authoritative SOA RR) and updciftr01.csd.disa.mil. I could not reach *any* of the USNO.Navy.MIL DNS servers, period (The Naval Oceanographic Portal. (NoP) is up as I was able to FTP to Tycho and MAIA. I'm going to have to add Psyche.USNO.Navy.MIL to my /etc/hosts it seems (when I can figure out its IP address)). I must agree that a guaranteed 28% failure rate for USNO.Navy.MIL DNS lookups is unacceptable. The USNO SOA points to hostmaster(a)usno.navy.mil and none of the hosts in that MX RR are reachable. Does anyone have the 'phone number of a responsible person at USNO proper? The Petty Officer who answered the 'phone at the main number was less than helpful... (I hesitate to call Jeff Prillaman about this issue.)

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Blocked USNO sites was: Updated Public Domain leapseconds.list
by Chris Woodbury July 8, 2019

July 8, 2019

Brian et al, DoD sites are subject to frequent attack from the Internet. One of their defense strategies is to "go turtle"". Sometimes they're not there at all but, more often, they isolate just portion of their "space". (TRACERT ends in never-neverland.) I have discovered that, when this happens, the Navy.Mil and USNO.Navy.Mil DNS servers are often not reachable. As a result, while USNO sites are actually available though the Naval Oceanographic Portal (NoP) (point of presence (PoP) in Portsmouth, VA), their DNS entries are not. I, personally, solved part of this problem by adding the USNO sites I use to /etc/host (or its Windows equivalent, %WINDIR%\System32\drivers\etc\hosts). These are: 199.211.133.23 maia.usno.navy.mil 199.211.133.93 aa.usno.navy.mil 199.211.133.239 tycho.usno.navy.mil # Charon is a USNO.Navy.Mil DNS server on the NOP 199.211.133.5 charon.usno.navy.mil charon.nofs.navy.mil 192.68.148.66 charon.nofs.navy.mil 192.68.148.80 toshi.nofs.navy.mil MAIA also has backup servers for their data at NASA Goldstone Space Flight Center (cddis.gsfc.nasa.gov) and, as Brian mentioned, toshi.nofs.navy.mil. (At this instant, MAIA and Toshi are unavailable via HTTP but FTP is just fine (with /etc/host entries). If one is running a local DNS server, adding a pointer to USNO.Navy.Mil with a Charon.USNO.Navy.Mil NS RR might help the cause... Since I've done these things (particularly the /etc/hosts entries), I rarely have problems reaching USNO sites. Also, sometimes, DoD restrict themselves to Secure DNS. As I've got (some of) the certificate information installed, I may not have problems where others might. Lastly, occasionally I can't reach MAIA via HTTP but FTP works just fine. (I've just change my references to ser7.dat to FTP for that reason.) (Pardon my edits to the following. No words were removed...) > On Sat Jul 6 16:12:26 UTC 2019, Brian Inglis Brian.Inglis at SystematicSw.ab.ca wrote: >>On 2019-07-05 15:55, Chris Woodbury via tz wrote: >> # This NTP leap-second file was created with data obtained from >> # the United States Naval Observatory (USNO) MAIA FTP server. >> # >> # Find it at: <ftp://maia.usno.navy.mil/ser7/leapsec.dat> >> ... >> # See: http://maia.usno.navy.mil/ser7/ser7.txt > > Seems to be some DNS resolver and network blocking, possibly only > outside the US, to maia.usno.navy.mil ; interactive web browser access > and Naval Oceanography Portal to tycho.usno.navy.mil and aa.usno.navy.mil > mostly work, but web browser ftp access does not, and non web browser > resolution and access do not, e.g. host or wget; however everything resolves > and is accessible form the browser and command line from toshi.nofs.navy.mil. > Some other previous reports back this up, but there were no followups to say > whether issues were temporary and cleared up, or persisted and were permanent. > > It may be possible that lookups or accesses may be rate limited to deter > intrusions, or entries may have expired because they may be offline for July 4 > thru the weekend, or sites may be blocked due to lack of monitoring staff or > funding for non-defense services.

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Re: [tz] DST in Detroit 1967
by Paul Eggert July 7, 2019

July 7, 2019

Alois Treindl wrote: > So whether it was DST or not, at the time given in the article light cannot have > started to fail That depends on what the article's author Bill Dow meant by "fail". In a burning city, light could "fail" well before astronomical sunset. > You say in your comment that you have seen "multiple reports that (Shanks DST > data) is incorrect." > > I am curious what those other reports might be. Sorry, I don't remember the details. As I vaguely recall, the situation in Michigan was chaotic. The state rebelled against the federal daylight-saving law, some counties rebelled against the state, cases went to the state supreme court which may have (temporarily?) suspended the state's suspension of DST, and I don't know of any reliable catalog of what actually happened that year in Detroit. Perhaps someone could spring the money and read all the stories in the Detroit Free Press and Detroit News archives related to daylight saving time that year. I expect there would be dozens of stories to wade through. Let's hope the competing newspapers in Detroit didn't follow the model of Nashville in the previous decade. That Nashville story is so entertaining that it should be promoted from our email archive to the northamerica comments. Proposed patch attached.

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Blocked USNO sites was: Updated Public Domain leapseconds.list
by Chris Woodbury July 6, 2019

July 6, 2019

For reasons I can not fathom, I did not check on all the links in the leap-seconds.list I just submitted to the list. As a result, I failed to notice that the link to IERS Bulletin A was incorrect. The proper link is: # <ftp://maia.usno.navy.mil/ser7/ser7.dat> ^^^ Also available via HTTP. Note: the FTP and HTTP versions *have different timestamps* (and therefore are most likely separate files in different file structures). Otherwise, the files are identical. (This is why I've got alias cp='cp --preserve=timestamps' in my run commands....) Also, I managed to include a dot (.) at the end of a link in my first Bulletin C number 58 message. The proper URL for the directory in which to find the IERS leap-seconds.list file is: <ftp://hpiers.obspm.fr/iers/bul/bulc/ntp/> "leap-seconds.list" is a symbolic link. Its "real" name is "leap-seconds.3771235866" (4 Jul 2019 15:31:06 CEST) One may also use HTTP or HTTPS protocols to get there. Sorry about that.

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Updated Public Domain leapseconds.list
by Chris Woodbury July 6, 2019

July 6, 2019

# -=*( This file is in the public domain )*=- # This NTP leap-second file was created with data obtained from # the United States Naval Observatory (USNO) MAIA FTP server. # # Find it at: <ftp://maia.usno.navy.mil/ser7/leapsec.dat> # Updated using information from IERS Bulletin C 58 (4 Jul 2019) # Found at <ftp://hpiers.obspm.fr/iers/bul/bulc/bulletinc.dat> # # Bulletin C 58 did not announce a new leap-second. # The last leap-second occurred on 1 Jan 2017 (3692217600). # # -=<*>=- # # This file is not produced by a national metrology laboratory. # It *is* created using data from one: # # United States Naval Observatory (USNO) # IERS Rapid Service/Prediction Center for Earth Orientation # 3450 Massachusetts Ave NW, Washington, DC 20392 # # It should be noted that anyone with proper information can # generate an NTP leap-seconds.list file. # # This file's generation was originally necessitated by a U.S. # government shutdown and the resulting lack of an NIST or USNO # generated file until late in January 2019. # # -=<*>=- # # The Network Time Protocol (NTP) keeps time in Coordinated # Universal Time (UTC). UTC is a time scale based upon # Standard International (SI) seconds and derived from Temps # Atomique International (TAI). UTC is the basis for legal # time since 1 Jan 1972 0h. # # [Le] Bureau International des Poids et Mesures (BIPM) tracks # TAI, UT1, TE and UTC uses a weighted ensemble of 420+ atomic # clocks at over 80+ national metrology laboratories worldwide # to track time and Very-Long-Baseline Interferometry (VLBI) # for precision millisecond pulsars timing and to track Earth's # orientation in space. The origin of TAI has been agreed # officially to coincide with UT1 on 1 January 1958 0h. # # For further information, read BIPM monograph "Time Scales" # found at: # # <https://www.bipm.org/... # utils/common/pdf/monographies-misc/Monographie1994-1.pdf> # # And "Coordinated Universal Time" at: # # <https://www.bipm.org/cc/CCTF/Allowed/18/CCTF_09-32_noteUTC.pdf> # # And, lastly: # # "Atomic Time Scales for Dynamical Astronomy" pp.51-56 # # "How Can Millisecond Pulsars Improve the Long-Term Stability # of Atomic Time Scales?", pp.57-60: # # Proceedings of the 6th European Frequency and Time Forum # (17-19 March 1992) # # <http://www.eftf.org/proceedings/proceedingsEFTF1992.pdf> # # -=<*>=- # # Leap seconds are an official correction to UTC to keep it # within 0.9 seconds of UT1; yet another time standard # based upon the orientation of the earth in space (and the # basis of legal time until 1972). IERS Bulletin A keeps # track of and predicts the value of UT1-UTC. # # See: http://maia.usno.navy.mil/ser7/ser7.txt # # The data kept in "leap-seconds.list" are used by the # Network Time Protocol daemon (NTPd) to determine when to # apply leap seconds to Coordinated Universal Time (UTC). # "leap-seconds.list" is a symbolic link to the actual # file name, leap-seconds.xxxxxxxxxx, where xxxxxxxxxx # is derived from the NTP update timestamp (below). # # Theoretically, a leap second may be positive or negative. # Realistically, negative leap seconds are unlikely to occur. # # All timestamps in this leap seconds file are encoded using the # NTP epoch. These timestamps represent the number of seconds # since 1 Jan 1900 0:00:00. This is Modified Julian Date (MJD) # 15020 and Julian Date 2415020.5. There will be an unsigned # 32-bit overflow to the second NTP era in 2036 (07 Feb 2036 # 06:28:16 UTC to be precise). # # A leap second datum consists of an NTP timestamp and the # number of seconds difference between TAI and UTC (e.g. # currently TAI-UTC is 37). UTC was established (at # midnight) on 1 Jan 1972 0h with TAI-UTC started at 10. # There was no mechanism prior to that time defining when # to apply leap seconds. # # Note: the first datum in the leap-seconds.list file is # *not* a leap-second; it denotes the definition of the # UTC timescale. # # Leap-seconds rules are establish in: # # International Telecommunications Union-Recommendation (ITU-R) # 460-6 (Standard-frequency and Time-Signal Emissions), # Annex 1 (Time scales), Section 2 (Leap-Seconds). # # Note: Version 460-6 of the Recommendation is incorporated # by reference in the [ITU] Radio Regulations. # # <http://www.itu.int/rec/R-REC-TF.460-6-200202-I/> # # Section 2.3: Delegates leap-second timing/dissemination to the # International Earth Rotation and Reference System Service (IERS), # (in its role as inheritor of Bureau International de l'Heure (BIH)). # # NTP Leap second files have an update time (#$). This is often # the UTC zero (0) hour time of the day when the leap second file # is built. [I am of the opinion] it should be updated whenever # a new IERS Bulletin C is issued. CCW] # #$ 3771187200 # # Leap second data have a lifetime. Traditionally, this ends on # the twenty-eighth (28) day of the month six months after the # period of time described in the latest IERS Bulletin C. This # is the expiry time (#@). # # File expires on: 28 Jun 2020 # #@ 3802291200 # # Leap second files have a hash, as define in NIST's FIPS 180 # Secure Hash Standard (SHS), current revision 4 (FIPS 180-4). # # FIPS Publications: <http://csrc.nist.gov/publications/fips/> # Direct Link: <http://dx.doi.org/10.6028/NIST.FIPS.180-4> # # It is based on an SHA[1] digest, created using the data # portions of the file including leap second data and the update # and expiry timestamps. All "white space" and comments are # ignored in the computation thereof. The 160-bit SHA[1] # digest polynomial are encoded in five hexadecimal grouping at # the end of the file (#h). The hash itself is NOT included in # the SHA[1]. It can also be calculated using GNU sha1sum which # generates the same 160-bit digest, given the same data, in # forty hexadecimal characters. # # Additionally, there may be an "#SHA256" digest record. If # present, it is a FIPS-180 SHA256 digest that includes the # same records as "#h" plus the comment Day, Month and Year # included in each NTP leap-second record (thus making it # possible to *verify* those comments as well as the file time- # stamps, and NTP leap-second data. # # NTP delta #timestamp T Date of Change # 2272060800 10 # 1 Jan 1972 (MJD 41317) 2287785600 11 # 1 Jul 1972 (MJD 41499) 2303683200 12 # 1 Jan 1973 (MJD 41683) 2335219200 13 # 1 Jan 1974 (MJD 42048) 2366755200 14 # 1 Jan 1975 (MJD 42413) 2398291200 15 # 1 Jan 1976 (MJD 42778) 2429913600 16 # 1 Jan 1977 (MJD 43144) 2461449600 17 # 1 Jan 1978 (MJD 43509) 2492985600 18 # 1 Jan 1979 (MJD 43874) 2524521600 19 # 1 Jan 1980 (MJD 44239) 2571782400 20 # 1 Jul 1981 (MJD 44786) 2603318400 21 # 1 Jul 1982 (MJD 45151) 2634854400 22 # 1 Jul 1983 (MJD 45516) 2698012800 23 # 1 Jul 1985 (MJD 46247) 2776982400 24 # 1 Jan 1988 (MJD 47161) 2840140800 25 # 1 Jan 1990 (MJD 47892) 2871676800 26 # 1 Jan 1991 (MJD 48257) 2918937600 27 # 1 Jul 1992 (MJD 48804) 2950473600 28 # 1 Jul 1993 (MJD 49169) 2982009600 29 # 1 Jul 1994 (MJD 49534) 3029443200 30 # 1 Jan 1996 (MJD 50083) 3076704000 31 # 1 Jul 1997 (MJD 50630) 3124137600 32 # 1 Jan 1999 (MJD 51179) 3345062400 33 # 1 Jan 2006 (MJD 53736) 3439756800 34 # 1 Jan 2009 (MJD 54832) 3550089600 35 # 1 Jul 2012 (MJD 56109) 3644697600 36 # 1 Jul 2015 (MJD 57204) 3692217600 37 # 1 Jan 2017 (MJD 57754) # #SHA256: 128f9463dc3828a1c7a611a4017bc311aabdfbe4c33fd8278a63bed7ef3ba0e2 #h bca6f457 5f358e20 a63e0aab a79ad3c3 c0a21083

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Bulletin C number 58
by Chris Woodbury July 6, 2019

July 6, 2019

Christian Bizouard has struck again (and exactly a week earlier than I was expecting). No new leap-second. I predict (after a careful perusal of Bulletin A) that we will see one in July 2020. i.e.: 3802550400 38 # 1 Jul 2020 There is a new, IERS leap-seconds.3771235866 file at https://hpiers.obspm.fr/iers/bul/bulc/ntp. Dr. Levine and Jeff Prillaman will no doubt shortly generate NIST and USNO versions respectively. (Today is a federal holiday in the US.) For those who can't wait, I have attached another leap-seconds.list file, Eggert_leap-seconds.3771187200, which has a FIPS style SHA-256 digest that includes the erstwhile day, month and year from the comments. Happy (U.S.) Independence Day !!

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