diff --git a/.rubocop.yml b/.rubocop.yml
index afb11910f..307bc088d 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -777,7 +777,7 @@ Rails/SkipsModelValidations:
   Enabled: false
 
 Rails/TimeZone:
-  Enabled: true
+  EnforcedStyle: strict
 
 Rails/UniqBeforePluck:
   Enabled: true
diff --git a/app/controllers/administrateurs/activate_controller.rb b/app/controllers/administrateurs/activate_controller.rb
index dc2347e8b..96b441263 100644
--- a/app/controllers/administrateurs/activate_controller.rb
+++ b/app/controllers/administrateurs/activate_controller.rb
@@ -8,7 +8,7 @@ class Administrateurs::ActivateController < ApplicationController
 
     if @administrateur
       # the administrateur activates its account from an email
-      trust_device
+      trust_device(Time.zone.now)
     else
       flash.alert = "Le lien de validation d'administrateur a expiré, #{helpers.contact_link('contactez-nous', tags: 'lien expiré')} pour obtenir un nouveau lien."
       redirect_to root_path
diff --git a/app/controllers/gestionnaires/activate_controller.rb b/app/controllers/gestionnaires/activate_controller.rb
index 02a855bb2..e9c141ad6 100644
--- a/app/controllers/gestionnaires/activate_controller.rb
+++ b/app/controllers/gestionnaires/activate_controller.rb
@@ -6,7 +6,7 @@ class Gestionnaires::ActivateController < ApplicationController
 
     if @gestionnaire
       # the gestionnaire activates its account from an email
-      trust_device
+      trust_device(Time.zone.now)
     else
       flash.alert = "Le lien de validation du compte instructeur a expiré, #{helpers.contact_link('contactez-nous', tags: 'lien expiré')} pour obtenir un nouveau lien."
       redirect_to root_path
diff --git a/app/controllers/users/confirmations_controller.rb b/app/controllers/users/confirmations_controller.rb
index a93ac5600..ec5755987 100644
--- a/app/controllers/users/confirmations_controller.rb
+++ b/app/controllers/users/confirmations_controller.rb
@@ -34,7 +34,7 @@ class Users::ConfirmationsController < Devise::ConfirmationsController
     # Avoid keeping auto-sign-in links in users inboxes for too long.
     # 95% of users confirm their account within two hours.
     auto_sign_in_timeout = 2.hours
-    resource.confirmation_sent_at + auto_sign_in_timeout > DateTime.current
+    resource.confirmation_sent_at + auto_sign_in_timeout > Time.zone.now
   end
 
   # The path used after confirmation.
diff --git a/app/models/deleted_dossier.rb b/app/models/deleted_dossier.rb
index 9fba98749..25338f6b4 100644
--- a/app/models/deleted_dossier.rb
+++ b/app/models/deleted_dossier.rb
@@ -2,6 +2,6 @@ class DeletedDossier < ApplicationRecord
   belongs_to :procedure
 
   def self.create_from_dossier(dossier)
-    DeletedDossier.create!(dossier_id: dossier.id, procedure: dossier.procedure, state: dossier.state, deleted_at: Time.now.utc)
+    DeletedDossier.create!(dossier_id: dossier.id, procedure: dossier.procedure, state: dossier.state, deleted_at: Time.zone.now)
   end
 end
diff --git a/app/models/procedure.rb b/app/models/procedure.rb
index c48b3ff37..992f273db 100644
--- a/app/models/procedure.rb
+++ b/app/models/procedure.rb
@@ -456,7 +456,7 @@ class Procedure < ApplicationRecord
   def percentile_time(start_attribute, end_attribute, p)
     times = dossiers
       .state_termine
-      .where(end_attribute => 1.month.ago..DateTime.current)
+      .where(end_attribute => 1.month.ago..Time.zone.now)
       .pluck(start_attribute, end_attribute)
       .map { |(start_date, end_date)| end_date - start_date }
 
diff --git a/app/views/shared/dossiers/_demande.html.haml b/app/views/shared/dossiers/_demande.html.haml
index 3d9ba3de8..1ac304855 100644
--- a/app/views/shared/dossiers/_demande.html.haml
+++ b/app/views/shared/dossiers/_demande.html.haml
@@ -1,4 +1,8 @@
 .container
+  - if dossier.en_construction_at.present?
+    .card
+      = render partial: "shared/dossiers/horodatage", locals: { dossier: dossier }
+
   .tab-title Identité du demandeur
   .card
     = render partial: "shared/dossiers/user_infos", locals: { user: dossier.user }
diff --git a/app/views/shared/dossiers/_horodatage.html.haml b/app/views/shared/dossiers/_horodatage.html.haml
new file mode 100644
index 000000000..c97b9c601
--- /dev/null
+++ b/app/views/shared/dossiers/_horodatage.html.haml
@@ -0,0 +1,5 @@
+%table.table.vertical.dossier-champs
+  %tbody
+    %tr
+      %th.libelle Déposé le :
+      %td= l(dossier.en_construction_at, format: '%d %B %Y')
diff --git a/lib/tasks/task_helper.rb b/lib/tasks/task_helper.rb
index 7443af5ff..8be2ab6dc 100644
--- a/lib/tasks/task_helper.rb
+++ b/lib/tasks/task_helper.rb
@@ -60,7 +60,7 @@ class ProgressReport
 
   def format_duration(seconds)
     if seconds.finite?
-      Time.at(seconds).utc.strftime('%H:%M:%S')
+      Time.zone.at(seconds).strftime('%H:%M:%S')
     else
       '--:--:--'
     end
diff --git a/spec/mailers/previews/administrateur_mailer_preview.rb b/spec/mailers/previews/administrateur_mailer_preview.rb
index afa8762a0..18730819c 100644
--- a/spec/mailers/previews/administrateur_mailer_preview.rb
+++ b/spec/mailers/previews/administrateur_mailer_preview.rb
@@ -1,6 +1,6 @@
 class AdministrateurMailerPreview < ActionMailer::Preview
   def activate_before_expiration
-    administrateur = Administrateur.new(reset_password_sent_at: Time.now.utc)
+    administrateur = Administrateur.new(reset_password_sent_at: Time.zone.now)
 
     AdministrateurMailer.activate_before_expiration(administrateur, "a4d4e4f4b4d445")
   end
diff --git a/spec/views/new_user/dossiers/demande.html.haml_spec.rb b/spec/views/new_user/dossiers/demande.html.haml_spec.rb
index 074c55d78..869128d92 100644
--- a/spec/views/new_user/dossiers/demande.html.haml_spec.rb
+++ b/spec/views/new_user/dossiers/demande.html.haml_spec.rb
@@ -16,6 +16,7 @@ describe 'new_user/dossiers/demande.html.haml', type: :view do
   end
 
   it 'renders the dossier infos' do
+    expect(rendered).to have_text('Déposé le')
     expect(rendered).to have_text('Identité')
     expect(rendered).to have_text('Demande')
     expect(rendered).to have_text('Pièces jointes')
@@ -29,4 +30,10 @@ describe 'new_user/dossiers/demande.html.haml', type: :view do
     let(:dossier) { create(:dossier, :en_instruction, :with_entreprise, procedure: procedure) }
     it { is_expected.not_to have_link('Modifier le dossier') }
   end
+
+  context 'when the dossier has no en_construction_at date' do
+    let(:dossier) { create(:dossier, :with_entreprise, procedure: procedure) }
+
+    it { expect(rendered).not_to have_text('Déposé le') }
+  end
 end