Re: [Tzdist] Next step

Tim Parenti <tim@timtimeonline.com> Wed, 21 October 2015 21:34 UTC

Return-Path: <tim@timtimeonline.com>
X-Original-To: tzdist@ietfa.amsl.com
Delivered-To: tzdist@ietfa.amsl.com
Received: from localhost (ietfa.amsl.com [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E37301B314C for <tzdist@ietfa.amsl.com>; Wed, 21 Oct 2015 14:34:28 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -1.198
X-Spam-Level:
X-Spam-Status: No, score=-1.198 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, FM_FORGED_GMAIL=0.622, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_LOW=-0.7, SPF_NEUTRAL=0.779] autolearn=no
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id o8TUONRpv8WE for <tzdist@ietfa.amsl.com>; Wed, 21 Oct 2015 14:34:27 -0700 (PDT)
Received: from mail-ig0-f178.google.com (mail-ig0-f178.google.com [209.85.213.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 9C6241B314B for <tzdist@ietf.org>; Wed, 21 Oct 2015 14:34:27 -0700 (PDT)
Received: by igbkq10 with SMTP id kq10so108400337igb.0 for <tzdist@ietf.org>; Wed, 21 Oct 2015 14:34:27 -0700 (PDT)
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=Xk4DN5KXIa9M4ctebdpzEQEJp/sxhWXXE0GI4zrY90Y=; b=CaGBufk/mOW+3mLNvU/5V2aVP761YOSuLNRqZ5kRT4W3DTH/7K5Iyco0G0NOR9ipG6 TgnYAx9kFN3wmtlm1LWPxvtsbKrFG6etEzlNYzoajxHgF/RTQKwwmptI2+6SBnbIBhnS pXESkVSL7c9o99IA0VkUP1R43wels0x8n9vzvL4VXgbmmGOIgnm6nVzG8akt36Pz0ZT5 UOrcKHHwtjx1UEZ77A/8xYwXlSkUpHMzK2YhhlUlmSNEiJe6BB7S0nhyouXgzYlvn9PN 65GKWLFUxgQvF7/qWIKOwLy+ARpN9ACr4zG3sdoemR/0iD7NLEJd2nfhR8oW3TeQoV1L GHng==
X-Gm-Message-State: ALoCoQnRwgmrmqgmAHC9s0hYtZnqfrPMuEpP/tbkKyr8MzYKbXXxz1spbKYfKwp1ebP1HRLFERnX
X-Received: by 10.50.8.40 with SMTP id o8mr34348787iga.4.1445463266906; Wed, 21 Oct 2015 14:34:26 -0700 (PDT)
Received: from mail-io0-f174.google.com (mail-io0-f174.google.com. [209.85.223.174]) by smtp.gmail.com with ESMTPSA id pi6sm12872132igb.21.2015.10.21.14.34.25 for <tzdist@ietf.org> (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 21 Oct 2015 14:34:26 -0700 (PDT)
Received: by iodv82 with SMTP id v82so72087785iod.0 for <tzdist@ietf.org>; Wed, 21 Oct 2015 14:34:25 -0700 (PDT)
MIME-Version: 1.0
X-Received: by 10.107.28.194 with SMTP id c185mr13015127ioc.15.1445463265525; Wed, 21 Oct 2015 14:34:25 -0700 (PDT)
Received: by 10.36.77.194 with HTTP; Wed, 21 Oct 2015 14:34:25 -0700 (PDT)
In-Reply-To: <56269131.3060305@cs.ucla.edu>
References: <CADZyTkmO_PcfWTw-36U_6vo=EuDAnAmvUo6nvPZjkHjb_ALPSQ@mail.gmail.com> <40285_1445262970_t9JDu8BA043191_50DBD330DB51FDFC0C3E86D4@cyrus.local> <5624FAC4.5030008@andrew.cmu.edu> <B38549591D4FFBE5A83BF0BD@cyrus.local> <56253CCB.6010602@gmail.com> <316D3AAC6E4A5336C1784897@caldav.corp.apple.com> <5625E08C.9040800@lsces.co.uk> <CAFpi07w7z3BZATsd895WL-mLpE2pkOc0j=Dsnow3VG7ECEZNBA@mail.gmail.com> <56269131.3060305@cs.ucla.edu>
Date: Wed, 21 Oct 2015 17:34:25 -0400
Message-ID: <CAFpi07ynv8J8LQavv5AWiRc3Na2twQLwS92YZ=E_09ob2fXZQQ@mail.gmail.com>
From: Tim Parenti <tim@timtimeonline.com>
To: Paul Eggert <eggert@cs.ucla.edu>
Content-Type: multipart/alternative; boundary=001a113ff8a07a76cc0522a42472
Archived-At: <http://mailarchive.ietf.org/arch/msg/tzdist/u-b3E_NeJu8lFQIaPwijY5YjNHM>
Cc: Time Zone Data Distribution Service <tzdist@ietf.org>
Subject: Re: [Tzdist] Next step
X-BeenThere: tzdist@ietf.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: <tzdist.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/tzdist>, <mailto:tzdist-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/tzdist/>
List-Post: <mailto:tzdist@ietf.org>
List-Help: <mailto:tzdist-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/tzdist>, <mailto:tzdist-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Oct 2015 21:34:29 -0000

On 20 October 2015 at 15:08, Paul Eggert <eggert@cs.ucla.edu>; wrote:

> On my list of tzdata things to do is to add a file zonenow.tab, which
> would be like zone1970.tab except with the cutoff being now, i.e., it would
> partition the world into regions where civil-time clocks agree from now
> into the predicted future (but may disagree in the past). A server that
> wants to cater only to current and future timestamps could limit itself to
> zones in zonenow.tab.


Good idea.  In a more general sense, this reminds me somewhat of the
"winnow" functionality discussed on tz briefly in 2013
<http://mm.icann.org/pipermail/tz/2013-September/thread.html#19741>;.
Properly implementing that for tz would possibly require a bit of a
re-architecting on that project. (e.g., How do we indicate which of the
America/Indiana/* zones is the main one if we winnow from, say, 2000?)

Perhaps that's ultimately worthwhile, but I'm not sure where that ranks on
the priority queue of all the possible things tz could be implementing,
especially those which would require some re-architecting anyway...

--
Tim Parenti