Hi, Current issues of the Connaissance des Temps do not cover legal time - much of such auxiliary material has been transferred much earlier to the Annuaire (which since 1978 has appeared under varying names).
The International Meridian Conference (October 1884) is first mentioned in the Annuaire of 1886 https://gallica.bnf.fr/ark:/12148/bpt6k6541765k/f845.item >From then onwards (slowly at first) lists are published of countries which >adhere to the system of time zones ("fuseaux horaires") and countries which do >not, like France and its colonies until 1911. A typical list from the early 1900s can be seen here https://gallica.bnf.fr/ark:/12148/bpt6k65709985/f517.item (Annuaire for 1918) Not all issues have such a list - I am slowly working though all the issues and making a list of which issues have such a time zone list. In the editions after the Second World War the time zone information is much reduced and limited to France and its colonies only. The most recent issue of the Annuaire on Gallica (2021) only lists information for France https://gallica.bnf.fr/ark:/12148/bpt6k9127672b/f52.item (with a sourced list of day light savings from 1916 to 2020) Similar lists were also published in the British and American issues of the Astronomical Ephemeris and Nautical Almanac but issues from the 20th century are much less easy to find online. Rob van Gent -----Original Message----- From: Paul Eggert <[email protected]> Sent: Monday, 21 July 2025 00:37 To: Gent, R.H. van (Rob) <[email protected]> Cc: Time zone mailing list <[email protected]> Subject: Re: [tz] Annuaire pour l'an ...., publié par le Bureau de Longitudes as a useful source for historical time zone changes CAUTION: This email originated from outside of Utrecht University. Do not click links or open attachments unless you recognize the sender and know the content is safe. On 2025-07-20 05:53, Gent, R.H. van (Rob) via tz wrote: > the French Annuaire pour l'an ...., publié par le Bureau de Longitudes, > published annually since 1797 and available from the Gallica website, usually > contains a detailed section on the legal time in France, French colonies and > dependencies and elsewhere. Thanks for the pointer. Do you happen to know which editions of "Connaissance des temps" cover legal time? That would help us cite it, by letting people know timestamps for which it might be useful. I looked at the latest edition that I could find online, which was for 2002[1], and didn't see anything to do with legal time. Thanks. [1]: https://www.imcce.fr/content/medias/publications/publications-institutionnelles/connaissance-temps/2022.pdf
