Paul Eggert | 17 Dec 19:11 2014

Re: [tz] [Tzdist] Getting to closure Re: [tzdist] #31 (service): Include leap seconds?

On 12/17/2014 06:55 AM, Martin Burnicki wrote:
>
> 2.) We have the leap second file from TZ DB. This file has a different 
> format than the NIST file, but as far as I can see is simply generated 
> from a file in NIST format by a script which is part of the TZ DB 
> package. Unfortunately the expiration date is *not* migrated into the 
> TZ DB's leap second file, so some important information is lost.
>

Thanks for reporting this.  I have installed the attached fix in the 
experimental tz sources on github and it should appear in the next tz 
release.  I am cc'ing the tz mailing list to give them a heads-up.

> 3.) We have a leap second file from IERS, which is once more in a 
> different format than the ones mentioned above.
>
> In my opinion the IERS should be the authoritative source for a leap 
> second file (or table) since this is the institution deciding whether 
> a leap second is to be scheduled,

I would prefer this also.  However, the IERS file is copyrighted. That 
is why the tz database reproduces the NIST file (the NIST file is public 
domain).  Other distributors of the IERS file might want to keep this in 
mind.

Amusingly enough, the NIST file's expiration date disagrees with the 
IERS's.  As a practical matter the NIST's date is more conservative and 
is a better choice for applications like tz and tzdist and this is 
another argument for using the NIST file.

(Continue reading)

Naveed Shakur | 16 Dec 06:58 2014

[tz] Info regarding TZ database

Good day
My name is Naveed and I have some query regarding the TZ database, is it possible to query the timezone database maintained by IANA or any other possible solution to have a local copy of the same at our own premises, we have to integrate with our in-house application with timezone information.
 
Best Regards and Thank You
Naveed Shakur.
 
Ken Murchison | 12 Dec 14:50 2014
Picon

[tz] US Sep 30, 1945

All,

I'm wondering why the US rule for Sep 30, 1945 uses an explicit date 
rather than lastSun, where it would dovetail nicely into the existing 
rules for America/New_York, Chicago, Indiana/Indianapolis (and maybe 
others) which cover 1946-1954.

The only reason that I care is because when converting the TZ data into 
iCalendar VTIMEZONEs with vzic, the dst->std transition for 1945 doesn't 
get coalesced into the recurrence rule for 1946-1954. I won't bother 
going into the reason for how/why vzic isn't able to coalesce these, but 
I'm pretty sure that it would take a non-trivial amount of 
work/logic/code to fix it.

--

-- 
Kenneth Murchison
Principal Systems Software Engineer
Carnegie Mellon University

John Madziarczyk | 10 Dec 23:01 2014
Picon

[tz] U.S. 1946-1966 dst

Hi, 

I apologize is this question has been asked many times before, but is there any publication out there that lists all the observances and non-observances of Daylight Savings Time in the U.S. in the years between the end of World War II and the Uniform Time Act? 

John Madziarczyk
Steffen Thorsen | 8 Dec 14:18 2014

[tz] Quintana Roo change to EST?

The Mexican state of Quintana Roo will likely change to EST in 2015, by not
going back from DST in October 2015. Its a bit unclear if they will 
still observe
DST the years after.

Some sources in Spanish:
http://sipse.com/novedades/reconocen-el-trabajo-de-empresarios-con-cambio-de-huso-horario-126236.html
http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo

We have summed up the info in English here:
http://www.timeanddate.com/news/time/mexico-quintana-roo-time-zone.html

Best regards,
Steffen Thorsen - timeanddate.com

Alois Treindl | 7 Dec 17:11 2014
Picon

[tz] Mexico city 1950

Dear Paul

I am looking at the timezone for Mexico City 1950.

There is a special rules for DST 12 Feb - 31 July 1950, which seems to 
apply only to Mexico City.

I need to find out the definition of the geographic area for which this 
is valid.

You quote as a source
http://www.cddhcu.gob.mx/bibliot/publica/inveyana/polisoc/horver/
but I cannot access that source.

Do you happen to keep an offline copy of that source information?

Best regards

Alois

Susan Ferrara | 5 Dec 17:17 2014
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[tz] time zone 1948

Hi,
I was born in the Naval Hospital at Quantico Marine Base in August of 1948.  I would like to know if the base was using DST or EST during that time period.

Any advice you can give me as to how I can find this information would be greatly appreciated.
Thanks,
Susan Nichols
Arthur David Olson | 3 Dec 23:53 2014
Picon

[tz] Leap seconds

Given history to date, the leap second information needed by knowledgeable, concerned clients is, in its entirety:
    1972-06 1972-12 1973-12 1974-12 1975-12 1976-12 1977-12 1978-12 1979-12
    1981-06 1982-06 1983-06 1985-06 1987-12 1989-12
    1990-12 1992-06 1993-06 1994-06 1995-12 1997-06 1998-12
    2005-12 2008-12
    2012-06
These are the months at the ends of which leap seconds were inserted.*
I'm confident that a way of getting the information to such clients can be developed.

It may be prudent to wait and see if the status of the leap second changes in 2015;
a change may obviate the need for leap second updates (though not the need for information on past leap seconds).

    <at> dashdashado

*This ignores the possibility of skipped seconds, which have yet to occur in the wild.
It also ignores niceties such as New York City, which at least once "observed" the leap second at midnight New York time
rather than midnight UTC, making for a ball drop countdown of "Three...two...one...leap...Happy New Year!"


Steve Allen | 1 Dec 22:26 2014

[tz] Colorado permanent daylight initiative

Denver Post reports a ballot initiative attempt that would give voters
a chance to choose permanent daylight time for Colorado.

http://www.denverpost.com/news/ci_27044142/proposal-would-keep-colorado-daylight-savings

--
Steve Allen                 <sla <at> ucolick.org>                WGS-84 (GPS)
UCO/Lick Observatory--ISB   Natural Sciences II, Room 165    Lat  +36.99855
1156 High Street            Voice: +1 831 459 3046           Lng -122.06015
Santa Cruz, CA 95064        http://www.ucolick.org/~sla/     Hgt +250 m

Arthur David Olson | 30 Nov 01:46 2014
Picon

[tz] The Mysterious Cube

The wonders of modern technology allowed me to view the Superman episode "The Mysterious Cube" today, leading to the attached (and also included below) correction to tz-art.htm.

    <at> dashdashado

1.1
510 lines
1.2
510 lines
*** /tmp/,atz-art.htm    2014-11-29 19:42:45.598144300 -0500
--- /tmp/,btz-art.htm    2014-11-29 19:42:45.690149500 -0500
***************
*** 330,337 ****
  <li>
  An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
  Cube," first aired 1958-02-24, had Superman convincing the controllers
! of WWV to broadcast time signals five minutes ahead of actual time;
! doing so got a crook trying to beat the statute of limitations to
  emerge a bit too early from the titular enclosure.
  </li>
  <li>
--- 330,337 ----
  <li>
  An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
  Cube," first aired 1958-02-24, had Superman convincing the controllers
! of the Arlington Time Signal to broadcast ahead of actual time;
! doing so got a crook trying to be declared dead to
  emerge a bit too early from the titular enclosure.
  </li>
  <li>

1.1
510 lines
1.2
510 lines
*** /tmp/,atz-art.htm	2014-11-29 19:42:45.598144300 -0500
--- /tmp/,btz-art.htm	2014-11-29 19:42:45.690149500 -0500
***************
*** 330,337 ****
  <li>
  An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
  Cube," first aired 1958-02-24, had Superman convincing the controllers
! of WWV to broadcast time signals five minutes ahead of actual time;
! doing so got a crook trying to beat the statute of limitations to
  emerge a bit too early from the titular enclosure.
  </li>
  <li>
--- 330,337 ----
  <li>
  An episode of <em>The Adventures of Superman</em> entitled "The Mysterious
  Cube," first aired 1958-02-24, had Superman convincing the controllers
! of the Arlington Time Signal to broadcast ahead of actual time;
! doing so got a crook trying to be declared dead to
  emerge a bit too early from the titular enclosure.
  </li>
  <li>
Paul Eggert | 26 Nov 20:38 2014

Re: [tz] tzselect: Display Posix TZ format when used (#12)

Thanks for the fix.  I applied it (attached) with a news item (the 2nd 
attachment).

Gmane