[LEAPSECS] POSIX and C (Was: Re: ISO Influence)

Jonathan E. Hardis jhardis at tcs.wap.org
Fri Dec 24 20:21:02 EST 2010

On Dec 24, 2010, at 10:51 AM, Rob Seaman wrote:

>> On Dec 23, 2010, at 5:45 PM, Jonathan E. Hardis wrote:


>>> WHERE under U.S. jurisdiction is UTC (no offset) the legal, civil

>>> time?


>> Cleaner answers still await, however.


> Commercial aircraft in flight?

Close enough. U.S. Flag vessels, and I was thinking primarily of
ships. Ships in international waters are generally under the
jurisdiction of the flag state, and the zone of UTC+0 is found in the
south Atlantic Ocean, west of Africa, the north Atlantic Ocean, e.g.,
near the Canary Islands, and the North, Norwegian, and Greenland
Seas. http://www.lib.utexas.edu/maps/world_maps/timezones_2001.jpg

The other classic example of extraterritorial jurisdiction consists of
diplomatic posts, such as embassies. One can fuss about who actually
has jurisdiction over an embassy, the host nation or the represented
nation, but in general embassies follow local civil timekeeping
customs. While London may follow "GMT," I would guess that UTC would
be the legal, civil time in Dublin, Reykjavik, and Lisbon, and West
African capitals such as Dakar, Monrovia, and Rabat.

- Jonathan

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