On 2025-07-21 12:44, Paul Eggert via tz wrote:
On 2025-07-21 00:39, Gent, R.H. van (Rob) wrote:
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)
Thanks for the citation. It agrees with TZDB's Europe/Paris except for spring 1923, where things were chaotic and I see some evidence that TZDB is right and the Annuaire is wrong. Perhaps someone who knows French could get to the bottom of what happened to Parisian clocks in spring 1923.
Looked up laws from 1922 and 1923; the latter is after the Spring change so the prior law should be in effect; but unsure they will be of much help: Légifrance JORF n° 0073 du 15 mars 1922 https://www.legifrance.gouv.fr/jorf/jo/id/JORFCONT000000008324 Légifrance JORF n° 0139 du 25 mai 1923 https://www.legifrance.gouv.fr/jorf/jo/id/JORFCONT000000008416 (to download you have to answer an arithmetic challenge and sometimes numbers are expressed in French words) and attach Google translated extracts of each law (fixups only to «vingt-quatre heures» times translated as 11pm! instead of 12pm) and verbatim JO extracts of each law (with OCR fixups but messy layout /sic/).
In the meantime I adjusted comments to note the discrepancies by installing the attached proposed patches. The first proposed patch updates related commentary from Brazil's Divisão de Serviços da Hora (DISHO), which seems to have changed its name and acronym. The second proposed patch notes the spring 1923 disagreement between TZDB and the Annuaire and cites the New York Times report about Raymond Poincaré.
I was surprised to see that the 2020 Annuaire is the current edition. Have they stopped publishing it?
The current annual Ephemerides for 2025 can be downloaded free, and you can buy the current releases of «Guide de données astronomiques, Annuaire du Bureau des longitudes» PDF from EDP Sciences for €12.99 (but they are not yet free from Gallica): https://laboutique.edpsciences.fr/produit/1442/9782759835959/guide-de-donnee... ToC includes «L’heure en France»: https://www.imcce.fr/content/medias/publications/publications-institutionnel... -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retrancher but when there is no more to cut -- Antoine de Saint-Exupéry