[Datetime-SIG] Clearing up terminology

[Chris Barker - NOAA Federal]

> Fair enough: "EST is a offset", what is +1000 then?

Also an offset -- but one without a name -- In the general case, a
given offset may have more than one name.

EST is one name for a +5 offset. (Or is it minus 5?) but there are
other times on other timezones where the offset is 5.

> $ TZ=Australia/Melbourne date +"%c %Z%z"
> Thu Jul 30 10:46:45 2015 AEST+1000
>
> The point, however is that "EST" does not mean -0500 for everyone.

Showing my US centrism here!

If we're getting into naming schemes here, it clearly gets ugly --
honestly I have no idea whether AEST is an name for an offset or a
timezone. So when I said there can be more than one name for a given
offset, there can also be more than one offset for a given name.

Personally, I'm not really interested in the names, and the naming
issue is orthogonal to the rest of this discussion.

But I presume the Olson database has a naming scheme...

-CHB