Date: Fri, 6 Dec 2013 01:29:08 -0500 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: [PATCHv2] Add support for leap seconds in zoneinfo files On Fri, Dec 06, 2013 at 01:15:52AM +0000, Laurent Bercot wrote: > > >Regarding the unfortunate coupling of timezone and leapsecond data > >into a single file, do the zoneinfo files with leapseconds have their > >timezone transition times stored in POSIX time or TAI? > > TAI-10 (the 10 seconds offset is so it's the same as POSIX time > before 1972). As I said, it's the only behaviour that makes sense: > we're counting a number of seconds and we want it to be unambiguous. > POSIX time would create an ambiguity for the very moment when a leap > second happens, which defeats the purpose. The reason I asked is that it means, if you're using TAI-10, you have to have matching zoneinfo files for the daylight time transitions to work correctly. This really complicates the matter of having POSIX/TAI and TZ be separate... > >At the very least they would have some overhead determining that > >leapseconds aren't in use. > > Indeed, one test at executable start. :) At first use. Definitely not at executable start. > Do you have any idea what form this test would take, if we're opting > away from TZ ? No, I don't know. Rich
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.