[tz] Converting cities to tz identifiers (tangent)
eggert at cs.ucla.edu
Tue Feb 20 22:25:49 UTC 2018
On 02/20/2018 09:46 AM, John Hawkinson wrote:
> in general, for most locations, the US/* ("backward") form seemed the better choice.
It depends on how portable you want to be. Some implementations do not
use the 'backward' file, so TZ='US/Eastern' does not work for them.
FreeBSD is one such, or at least it was the last time I recall checking;
see Garrett Wollman's email
<https://mm.icann.org/pipermail/tz/2008-May/014941.html>. So, in
practice I would say TZ='America/New_York' is more portable than
If New York ever switches to Atlantic time (unlikely but conceivable
given the current state of US politics), we'll link some other location
to US/Eastern in the 'backward' file. Although it's not now clear what
that other location would be (it'd depend on what part of the US
switches), one candidate would be America/Indiana/Indianapolis. This is
because if Jacksonville, Philadelphia and New York all switch to
Atlantic time, then Indianapolis could well be the largest remaining
city observing US Eastern time. This should amuse those of us who recall
the history of UT offsets in Indiana.
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