Une time zone est mise en place dans le fichier de config principal

app/views/events/index.html.haml

@@ -1,6 +1,3 @@
--# Otherwise the simple calendar could be empty during the first hours of a new month
-- Time.zone = 'Paris'
-
 %form.region_selector
   - if params[:start_date]
     = hidden_field_tag :start_date, params[:start_date]

config/application.rb

@@ -15,6 +15,7 @@ module AgendaDuLibreRails
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
     # config.time_zone = 'Central Time (US & Canada)'
+    config.time_zone = 'Paris'
 
     # The default locale is :en and all translations from config/locales/*.rb,yml are auto loaded.
     # config.i18n.load_path += Dir[Rails.root.join('my', 'locales', '*.{rb,yml}').to_s]