On Jan 7, 2014, at 5:50 PM, Brooks Harris wrote: > On 2014-01-07 03:58 PM, Warner Losh wrote: >> On Jan 7, 2014, at 4:56 PM, Brooks Harris wrote: >> >>> Oh yes, I've see that. Noted from this list. To me its both hysterical and >>> deeply troubling. On the one hand, it bemuses me to see someone else's >>> programming pain so well presented, mirroring my own, and, on the other, oh >>> isn't there please something we could do about it? >> Doubtful :(. >> >> I could likely do a similar rant about leap seconds from a programmer's >> perspective of similar length too.... >> >> Warner > > Yeah, I'm sure most on this list have similar experience. Hey, we could start > a reality tv show!
Leap second war story death match! Warner > -Brooks > >> >> >>> On 2014-01-07 03:40 PM, Warner Losh wrote: >>>> http://www.youtube.com/watch?v=-5wpm-gesOY is required viewing. >>>> >>>> Warner >>>> >>>> On Jan 7, 2014, at 4:22 PM, Brooks Harris wrote: >>>> >>>>> Hi, >>>>> >>>>> First, this is my first posting to your list, forgive me if the subject >>>>> has been covered. >>>>> >>>>> Second, I am a colleague Stephen Scott, also a new subscriber who posted >>>>> a question earlier this week - (Subject: Local insertion of leap seconds). >>>>> >>>>> My question is about the current state of standards concerning time zones. >>>>> >>>>> Steve Allen's "Time Scales" >>>>> http://www.ucolick.org/~sla/leapsecs/timescales.html >>>>> <http://www.ucolick.org/%7Esla/leapsecs/timescales.html> is a tremendous >>>>> help in many regards, and my thanks and appreciation for the work >>>>> collected there. But it seems to side-step explanation of time zones, and >>>>> its here I'm asking for guidance. >>>>> >>>>> I fully understand time zone specifications are fractured. My objective >>>>> is to determine what standards are most relevant currently, that is, what >>>>> standards may be considered "in force". And where none exist, to state >>>>> some sort of rules of "common use" or "common practice" without referring >>>>> to the impossibly large collection of local jurisdictions and laws. >>>>> >>>>> In particular - >>>>> >>>>> A) "International Date Line", which is probably not standardized except >>>>> by local decree, but the "180 degrees from the Greenwich meridian" has >>>>> provenance back to the "International Meridian Conference of 1884" (not >>>>> its proper name). Is there more modern standard that codifies this in any >>>>> way? >>>>> >>>>> B) The "International Meridian Conference of 1884" contains significant >>>>> discussion of the idea "That these standard meridians should continue to >>>>> be designated as even multiples of fifteen degrees from Greenwich", but >>>>> there appears to be no explicit resolution of vote on the topic. I am >>>>> unable to pick up the trail from there. There are many references in >>>>> other conferences preceding and after the 1984 conference, but I have not >>>>> discovered any official action on the subject. Again, is there any modern >>>>> standard regarding that issue? >>>>> >>>>> ISO 8601 describes using "offset from UTC" to indicate "time zone", but >>>>> as far as I can tell it does not state either what a "time zone" may be >>>>> or why an offset to a "time zone" from UTC might be useful. Is there any >>>>> other standard that might describe this relation of UTC (zulu) to the >>>>> "time zone" or "local time" more rigorously? >>>>> >>>>> Of course the definition of "Greenwich meridian" has undergone many >>>>> refinements and name changes since 1884. Claude Boucher describes the >>>>> state of Formal international recognition of the International >>>>> Terrestrial Reference System (ITRS) >>>>> >>>>> https://www.google.com/#q=Formal+international+recognition+of+the+International+Terrestrial+Reference+System+(ITRS). >>>>> >>>>> Are there descriptions of "time zones" amongst the standards in this >>>>> field? >>>>> >>>>> And, of course, there is the subject of "Daylight Savings", apparently >>>>> begun by George Vernon Hudson. Are there any modern standards or >>>>> implementation guidance documents in force? >>>>> >>>>> I'm aware of tz databse, of course, but here too there seems to be lack >>>>> of clarity about what rules are being implemented, or, at least, I've >>>>> found no consolidated statements of those rules there. >>>>> >>>>> Comments and guidence welcomed, thanks very much, >>>>> >>>>> -Brooks Harris >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> LEAPSECS mailing list >>>>> [email protected] >>>>> http://six.pairlist.net/mailman/listinfo/leapsecs >>>> _______________________________________________ >>>> LEAPSECS mailing list >>>> [email protected] >>>> http://six.pairlist.net/mailman/listinfo/leapsecs >>>> >>>> >>> _______________________________________________ >>> LEAPSECS mailing list >>> [email protected] >>> http://six.pairlist.net/mailman/listinfo/leapsecs >> _______________________________________________ >> LEAPSECS mailing list >> [email protected] >> http://six.pairlist.net/mailman/listinfo/leapsecs >> >> > > _______________________________________________ > LEAPSECS mailing list > [email protected] > http://six.pairlist.net/mailman/listinfo/leapsecs _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
