FW: FW: Time Zone in Paris

Olson, Arthur David (NIH/NCI) [E] olsona at dc37a.nci.nih.gov
Sat Sep 25 13:10:12 UTC 2010

I'm forwarding this message from Katia, who is not the time zone mailing list. Those of you who are on the list, please direct replies appropriately.


-----Original Message-----
From: Katia [mailto:katia at astrologiainlinea.it] 
Sent: Saturday, September 25, 2010 6:44
To: 'Paul Eggert'
Cc: tz at lecserver.nci.nih.gov
Subject: R: FW: Time Zone in Paris

Thank you for your reply and for having put my question in the mailing lists to which I will enjoy soon. 
The problem is that according to the downloaded version of the database on the Google site for updates http://code.google.com/p/tzdata/ in 1971 the time zone in Paris wasn't one hour ahead of UTC. 
Here is part of Paris file in XML version

- <period>
- <period>

Is that file correct ?


-----Messaggio originale-----
Da: Paul Eggert [mailto:eggert at cs.ucla.edu] 
Inviato: giovedì 23 settembre 2010 06:37
A: katia at astrologiainlinea.it
Cc: tz at elsie.nci.nih.gov
Oggetto: Re: FW: Time Zone in Paris

Katia wrote:

> With regard to the time zone of Paris from 1945 to 1976 it results a
> strange data that conflicts over other resources credited as Shank,
> according to your database in 1971 the Time zone Paris was 0.

Sorry, I don't see that problem.  According to the tz database, the
time zone in Paris was one hour ahead of UTC during that period.  This
agrees with Shanks & Pottenger 2003 (ISBN 0-035127-88-7); I just now
checked my printed copy.  It also agrees with the Ephemerides
Astronomiques for 1998 from Bureau des Longitudes, according to email
that we received on 1997-12-12 from Denis Excoffier.  These two
sources disagree only about exactly when this long period of UTC+1 ended.
Shanks & Pottenger say that it ended on 1976-03-28 at 02:00 local
time, whereas Excoffier wrote that it ended at 00:00 UTC, i.e., at
01:00 local time.  Currently the tz database agrees with Excoffier,
but we always welcome any more-authoritative sources, such as reliable
newspapers published at the time.

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