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At 02:36 PM 11/9/2015, Random832 wrote:<br>
<blockquote type=cite class=cite cite="">As far as I know, tzdb's policy
is to have the "borders" of each zone<br>
exclusively follow de facto observance, without any distinction
between<br>
"officially A, unofficially B" vs the bulk of the "B"
zone, unless the<br>
situation changed some time between 1970 and now.</blockquote><br>
Interesting. For areas that have such unofficial deviations, there
can be great discrepancy in the scope of observance, geographically and
otherwise. <br><br>
For example, it US Federal facilities rarely observe an unofficial time
zone. But there are exceptions - such as the Guadalupe Mountains
National Park. <br><br>
Even local government may set their clocks to official time - but not
always. City hall offices in Phenix City AL are set to Eastern
Time.<br><br>
And where the lines get fuzzy, where the economic or social influence
that led to the exception wanes, two next door neighbors may have their
clocks set differently depending on where the most of the bread in that
household is won or spent.<br><br>
When researching Fort Pierre SD I had one knowledgeable local resource
tell me the observance extended about 50 miles west of the city.
Another equally knowledgeable local insisted it was no more than 20
miles.<br><br>
So I guess that raises the question, what really *is* de facto
observance.<br><br>
Regardless, I believe all of the exceptions I listed, and Hyder, predate
1970. <br><br>
Regards,<br><br>
Steve Jones<br><br>
<img src="cid:.0" width=200 height=149 alt="Emacs!"><br><br>
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