[tz] Correcting daylight-savings time for central Missouri prior to 1967

[Guy Harris]

On Nov 23, 2018, at 2:17 PM, Robert Elz <kre at munnari.OZ.AU> wrote:

>    Date:        Fri, 23 Nov 2018 15:52:19 -0500
>    From:        Jane Eisenstein <softweave at gmail.com>
>    Message-ID:  <7DD1D3F1-2C71-44DB-8794-2967D669D200 at gmail.com>
> 
>  | Perhaps. I would have to locate each of the exceptions and see whether any
>  | are adjoining. 
> 
> If you mean geographically, then no, that's not needed.   What makes a region
> is that the clocks set correctly show, and have shown, the same time, alyways,
> since  standardised times were introduced (or for definite inclusion in tzdb, since 
> 1970)    If two areas have always had the same local time, they can be
> represented by the same timezone (and would normally be so unless that
> looks to be by pure chance with no overriding reason it should be so).
> If the local time has ever differed (since 1970, and ideally, though we are not
> there yet, since standardied time) then they should be different zones.

So there is no requirement that a tzdb region be a connected space?