[tz] Will you add America/Boston?

Tue Jan 30 23:46:45 UTC 2018

I have to wonder what the rationale behind an America/Boston is, until they’ve 
made their decision on DST.

John Harris, Jr. <johnmh at splentity.com>
CTO, Splentity Software

On Tuesday, January 30, 2018 6:42:55 PM EST Guy Harris wrote:
> On Jan 30, 2018, at 3:05 PM, Paul G <paul at ganssle.io> wrote:
> > I imagine this will happen if Massachusetts goes through with the change
> > to year round Atlantic Time, but otherwise the name of the zone Boston is
> > in is America/New_York. I believe the zone naming is explained in the
> > theory file. Long story short: tzdb is not a mapping between cities and
> > their time zone, it's a list of time zones which happen to use city names
> > as keys.
> Or, rather, a list of regions of the earth that have observed the same time
> rules since 1970, which happen to be identified by keys constructed from
> city names.  A given tzdb region may move from one "time zone", in the
> sense in which it's often understood, to another "time zone", e.g., as the
> northamerica file in the tzdb data says, "Oliver County, ND switched from
> mountain to central time on 1992-10-25.", so America/North_Dakota/Center
> refers to a region that was part of the US Mountain time zone until
> 1992-10-25 and then was part of the US Central time zone.

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