FW: Time Zone in Paris

Gilles Espinasse g.esp at free.fr
Thu Sep 23 13:52:55 UTC 2010

----- Original Message ----- 
From: "Paul Eggert" <eggert at cs.ucla.edu>
To: <katia at astrologiainlinea.it>
Cc: <tz at lecserver.nci.nih.gov>
Sent: Thursday, September 23, 2010 6:36 AM
Subject: 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.
I didn't find a newpaper source archive from 1975 on the net.

Here is the legal text that define the 1976 time shift :
Text say Excoffier is right, time has been shifted 1 hour in advance at 0
hour UTC the 28 march 1976. The return was the 25 september 1976 at 23 hour
UTC (so the 26 at 1h in local time)..

On 1977, shift has been made at a different UTC time.
Summer shift was the 3 april 1977 at 2 hour UTC, time was shifted again 1
hour in advance.
The return was the 25 september 1977 at 1 hour UTC

You should be able to find any related change looking for 'heure legale' in


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