Re: Predictable Internet Time
Cyrus Daboo <cyrus@daboo.name> Tue, 03 January 2017 19:54 UTC
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Date: Tue, 03 Jan 2017 14:54:47 -0500
From: Cyrus Daboo <cyrus@daboo.name>
To: Ted Lemon <mellon@fugue.com>
Subject: Re: Predictable Internet Time
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References: <CAMm+LwgfQJ8aG5wB=d3fRbbeje3J9o7Z4_DCuP8DL88ouDeKzw@mail.gmail.com> <504e2cea0d1668c31486b05fec0a967a4446aefe@webmail.weijax.net> <CAMm+Lwi_jU6gjdtdM6a2n_9_89tUvWBNXxnMtSjTEA++h1D4Ew@mail.gmail.com> <e0a43370-751f-808c-3719-9716f9cd57d1@isi.edu> <alpine.DEB.2.11.1701031348430.7102@grey.csi.cam.ac.uk> <0bbfcd7c-11a7-0e7f-56f7-eee959b7a947@gmail.com> <CAMm+Lwi0sQyRE_2dMCkwTk7xTiK2JbHhHSPYMkdG2FeBw_6CNA@mail.gmail.com> <7BDE58D23ADF3BC046F8942D@caldav.corp.apple.com> <b27515e2-a36a-7bf2-0ca4-1fae31a9dc21@gmail.com> <04DD5DFCB528DCD404C81F78@caldav.corp.apple.com> <A193D619-7B59-4EFB-A773-B6F6E4FD5884@fugue.com>
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Cc: Phillip Hallam-Baker <phill@hallambaker.com>, IETF Discussion Mailing List <ietf@ietf.org>
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Hi Ted, --On January 3, 2017 at 1:51:54 PM -0500 Ted Lemon <mellon@fugue.com> wrote: >> No that simply does not work. Repeating events or alarms may not involve >> any UI at all, but the device may need to trigger those at a specific >> local time - that means time zone information has to be taken into >> account somewhere. This is a crucial fact of any calendaring and >> scheduling system that those of us who have been using iCalendar >> (RFC5545) fully appreciate. > > This is true, but any specific local time will always occur at a specific > universal time, so this isn't actually a problem. No! That is not true because a future local time is not guaranteed to be at a specific universal time because local government can change their time zone (or more likely) their daylight savings time transition at any time between now and said future time. i.e., you cannot "pre-cache" all the local time -> UTC mappings for a future recurring event and then just use the UTC values, because the time zone definition may change. -- Cyrus Daboo
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Toerless Eckert
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Izaac
- Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time sandy
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Eliot Lear
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Eliot Lear
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Cyrus Daboo
- Re: Predictable Internet Time Jared Mauch
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Cyrus Daboo
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Cyrus Daboo
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Ted Lemon
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Eliot Lear
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time John C Klensin
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Pete Resnick
- Re: Predictable Internet Time Cyrus Daboo
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Paul Eggert
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Philip Homburg
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Eliot Lear
- Re: Predictable Internet Time Harald Alvestrand
- Re: Predictable Internet Time Stewart Bryant
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Leif Johansson
- Re: Predictable Internet Time Eliot Lear
- Re: Predictable Internet Time Leif Johansson
- Re: Predictable Internet Time Phillip Hallam-Baker
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Michael Breuer
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Tony Finch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Patrik Fältström
- Re: Predictable Internet Time Joe Touch
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Nico Williams
- Re: Predictable Internet Time Harald Alvestrand