2015g: Is the 1:00 under Pacific/Norfolk "Rules" a typo?

Hello, Is the 1:00 under Pacific/Norfolk "Rules" a typo? # Norfolk # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Pacific/Norfolk 11:11:52 - LMT 1901 # Kingston 11:12 - NMT 1951 # Norfolk Mean Time 11:30 - NFT 1974 Oct 27 02:00 # Norfolk T. 11:30 1:00 NFST 1975 Mar 2 02:00 11:30 - NFT 2015 Oct 4 02:00 11:00 - NFT thanks Jim Marvel

On 19 October 2015 at 10:06, Marvel, Jim (CPCOE) <Jim.Marvel@honeywell.com> wrote:
Hello,
Is the 1:00 under Pacific/Norfolk "Rules" a typo?
No; the lines
11:30 - NFT 1974 Oct 27 02:00 # Norfolk T.
11:30 1:00 NFST 1975 Mar 2 02:00
indicate that, between 1974-10-27 02:00 local and 1975-03-02 02:00 local, Pacific/Norfolk observed Daylight Saving in the amount of one hour on top of its normal offset of UTC+11:30; that is, the area was on UTC+12:30 for that period. This was introduced recently <https://github.com/eggert/tz/commit/b7aa4806bc4268427f4e8e20ad37be1dc80fb8cb> and is documented accordingly: # From Paul Eggert (2015-09-23):
# Transitions before 2015 are from timeanddate.com, which consulted # the Norfolk Island Museum and the Australian Bureau of Meteorology's # Norfolk Island station, and found no record of Norfolk observing DST # other than in 1974/5. See: # http://www.timeanddate.com/time/australia/norfolk-island.html
-- Tim Parenti

This article in particular is good about describing this: https://web.archive.org/web/20140221080916/http://www.cstdbill.com/tzdb/tz-h... It's too bad that we have to use archive.org to get at this seemingly fundamental doc. Any way we could host it along side tz-link.html in the repo? Date: Mon, 19 Oct 2015 13:55:24 -0400 From: tim@timtimeonline.com To: Jim.Marvel@honeywell.com CC: tz@iana.org Subject: Re: [tz] 2015g: Is the 1:00 under Pacific/Norfolk "Rules" a typo? On 19 October 2015 at 10:06, Marvel, Jim (CPCOE) <Jim.Marvel@honeywell.com> wrote: Hello, Is the 1:00 under Pacific/Norfolk "Rules" a typo? No; the lines 11:30 - NFT 1974 Oct 27 02:00 # Norfolk T. 11:30 1:00 NFST 1975 Mar 2 02:00 indicate that, between 1974-10-27 02:00 local and 1975-03-02 02:00 local, Pacific/Norfolk observed Daylight Saving in the amount of one hour on top of its normal offset of UTC+11:30; that is, the area was on UTC+12:30 for that period. This was introduced recently and is documented accordingly: # From Paul Eggert (2015-09-23): # Transitions before 2015 are from timeanddate.com, which consulted # the Norfolk Island Museum and the Australian Bureau of Meteorology's # Norfolk Island station, and found no record of Norfolk observing DST # other than in 1974/5. See: # http://www.timeanddate.com/time/australia/norfolk-island.html-- Tim Parenti

Matt Johnson wrote:
This article in particular is good about describing this: https://web.archive.org/web/20140221080916/http://www.cstdbill.com/tzdb/tz-h...
It's too bad that we have to use archive.org to get at this seemingly fundamental doc. Any way we could host it along side tz-link.html in the repo?
It's copyrighted, so we can't just publish it ourselves. I'll CC: this message to Bill Seymour, to see whether he can't arrange to make this useful information available again, somewhere.

That paper can certainly be published by the IANA TZ folks. Indeed, I was a little surprised that Paul said that it's copyrighted. (Maybe there's an old version out there somewhere that's covered by the Boost license.) In any event, I've attached a version that says clearly that it's in the public domain. I wrote that quite a while ago to help me understand what the files are saying, and I'm not totally confident that I got everything exactly right. Perhaps an expert -- and I'm not one -- should pour over it to make sure that all the statements in the paper are actually true. 8-) --Bill Seymour On Mon, Oct 19, 2015 at 8:08 PM, Paul Eggert <eggert@cs.ucla.edu> wrote:
Matt Johnson wrote:
This article in particular is good about describing this:
https://web.archive.org/web/20140221080916/http://www.cstdbill.com/tzdb/tz-h...
It's too bad that we have to use archive.org to get at this seemingly fundamental doc. Any way we could host it along side tz-link.html in the repo?
It's copyrighted, so we can't just publish it ourselves. I'll CC: this message to Bill Seymour, to see whether he can't arrange to make this useful information available again, somewhere.

Bill Seymour wrote:
I've attached a version that says clearly that it's in the public domain.
Thanks. I finally got around to merging it into the tzcode web pages and installed the attached patches into the experimental version on GitHub. The first patch simply adds your web page; the second adapts it and the existing pages to each other and makes it acceptable to our web page checker and so forth.
I wrote that quite a while ago to help me understand what the files are saying, and I'm not totally confident that I got everything exactly right. Perhaps an expert -- and I'm not one -- should pour over it to make sure that all the statements in the paper are actually true. 8-)
Yes, that would be nice....
participants (5)
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Bill Seymour
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Marvel, Jim (CPCOE)
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Matt Johnson
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Paul Eggert
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Tim Parenti