[tz] Reason for removal of several TZ

Paul Eggert eggert at cs.ucla.edu
Mon Dec 4 18:37:35 UTC 2017


On 12/04/2017 02:00 AM, Derick Rethans wrote:
> I think you're missing "IST" for "Irish Standard Time"

Thanks, good catch (I assume you meant "Irish Summer Time"). I installed 
the first attached patch to fix that. IST is interesting because in 
summer 1916 it meant +00:34:38.9 as opposed to the modern +01.

Come to think of it, it's worth documenting the Dublin/Dunsink issue a 
bit more, including the question whether DMT was -00:25:21.1 or 
-00:25:22. It's possible that we're missing an 0.9-second transition for 
Dublin/Dunsink circa 1896, which presumably we'd model as a 
1-second-transition! I'll leave that just as a comment for now. I 
installed the second attached patch, plus the third to fix a typo.

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