In zone Europe/Paris one finds this comment: # Shanks & Pottenger give 1940 Jun 14 0:00; go with Excoffier and Le Corre. 0:00 France WE%sT 1940 Jun 14 23:00 I have found a documented source, which confirms that le Corre is correct and Shanks incorrect: Yvonne Poulle quotes in her article 'La France a l'heure allemande' the 'Bulletin municipal officiel', the official Paris city bulletin of 1940-06-15, which consisted only of one sheet of paper, with the following instruction for the population of Paris and Seine: --- (my translation from French) The prefecture of the Seine and the prefecture of the police communicate: The population is invited to advance clocks and watches on June 14th at 23 hours, so that they are adjusted forward to midnight. --- end quote