diff --git a/app/helpers/application_helper.rb b/app/helpers/application_helper.rb
index f2e84bd75..b99514ae8 100644
--- a/app/helpers/application_helper.rb
+++ b/app/helpers/application_helper.rb
@@ -112,4 +112,12 @@ module ApplicationHelper
       root_path
     end
   end
+
+  def try_format_date(date)
+    date.present? ? I18n.l(date) : ''
+  end
+
+  def try_format_datetime(datetime)
+    datetime.present? ? I18n.l(datetime) : ''
+  end
 end
diff --git a/app/models/champs/date_champ.rb b/app/models/champs/date_champ.rb
index ceddaec82..0fd0a2499 100644
--- a/app/models/champs/date_champ.rb
+++ b/app/models/champs/date_champ.rb
@@ -6,7 +6,7 @@ class Champs::DateChamp < Champ
   end
 
   def to_s
-    value.present? ? Date.parse(value).strftime('%d/%m/%Y') : ""
+    value.present? ? I18n.l(Date.parse(value)) : ""
   end
 
   private
diff --git a/app/models/champs/datetime_champ.rb b/app/models/champs/datetime_champ.rb
index 3995b39e2..c98377d15 100644
--- a/app/models/champs/datetime_champ.rb
+++ b/app/models/champs/datetime_champ.rb
@@ -5,6 +5,10 @@ class Champs::DatetimeChamp < Champ
     # Text search is pretty useless for datetimes so we’re not including these champs
   end
 
+  def to_s
+    value.present? ? I18n.l(Time.zone.parse(value)) : ""
+  end
+
   private
 
   def format_before_save
diff --git a/app/views/admin/procedures/_list.html.haml b/app/views/admin/procedures/_list.html.haml
index 39f9a4a4a..833a6a6fc 100644
--- a/app/views/admin/procedures/_list.html.haml
+++ b/app/views/admin/procedures/_list.html.haml
@@ -20,9 +20,9 @@
         - if procedure.publiee?
           %td.procedure-lien= link_to(procedure_lien(procedure), procedure_lien(procedure))
         - if procedure.publiee_ou_archivee?
-          %td= link_to(procedure.published_at.present? ? procedure.published_at.strftime('%d/%m/%Y %H:%M') : "", admin_procedure_href)
+          %td= link_to(procedure.published_at.present? ? try_format_datetime(procedure.published_at) : "", admin_procedure_href)
         - else
-          %td= link_to(procedure.created_at.strftime('%d/%m/%Y %H:%M'), admin_procedure_href)
+          %td= link_to(try_format_datetime(procedure.created_at), admin_procedure_href)
         %td
           = link_to('Cloner', admin_procedure_clone_path(procedure.id), data: { method: :put }, class: 'btn-sm btn-primary clone-btn')
           - if !procedure.publiee_ou_archivee?
diff --git a/app/views/administrateur_mailer/activate_before_expiration.haml b/app/views/administrateur_mailer/activate_before_expiration.haml
index 6f60a52cc..a5e0bea12 100644
--- a/app/views/administrateur_mailer/activate_before_expiration.haml
+++ b/app/views/administrateur_mailer/activate_before_expiration.haml
@@ -5,7 +5,7 @@
 
 %p
   Vous avez fait la demande d’un compte administrateur sur demarches-simplifiees.fr.
-  Votre compte a été créé mais reste inactif, il arrivera à expiration le #{@expiration_date.strftime("%d/%m/%Y")}
+  Votre compte a été créé mais reste inactif, il arrivera à expiration le #{try_format_date(@expiration_date)}
 
 %p
   Afin d’activer votre compte, veuillez cliquer sur le lien ci-dessous :
diff --git a/app/views/new_administrateur/procedure_administrateurs/_administrateur.html.haml b/app/views/new_administrateur/procedure_administrateurs/_administrateur.html.haml
index 65354f432..9277ae0ad 100644
--- a/app/views/new_administrateur/procedure_administrateurs/_administrateur.html.haml
+++ b/app/views/new_administrateur/procedure_administrateurs/_administrateur.html.haml
@@ -1,6 +1,6 @@
 %tr{ id: "procedure-#{@procedure.id}-administrateur-#{administrateur.id}" }
   %td= administrateur.email
-  %td= administrateur.created_at.strftime('%d/%m/%Y %H:%M')
+  %td= try_format_datetime(administrateur.created_at)
   %td= administrateur.registration_state
   %td
     - if administrateur == current_administrateur
diff --git a/app/views/shared/dossiers/_champ_row.html.haml b/app/views/shared/dossiers/_champ_row.html.haml
index 361c6e786..66d5b4807 100644
--- a/app/views/shared/dossiers/_champ_row.html.haml
+++ b/app/views/shared/dossiers/_champ_row.html.haml
@@ -30,6 +30,10 @@
               = render partial: "shared/champs/siret/show", locals: { champ: c, profile: profile }
             - when TypeDeChamp.type_champs.fetch(:textarea)
               = render partial: "shared/champs/textarea/show", locals: { champ: c }
+            - when TypeDeChamp.type_champs.fetch(:date)
+              = c.to_s
+            - when TypeDeChamp.type_champs.fetch(:datetime)
+              = c.to_s
             - else
               = sanitize(c.to_s)
 
@@ -37,4 +41,4 @@
         %td.updated-at
           %span{ class: highlight_if_unseen_class(demande_seen_at, c.updated_at) }
             modifié le
-            = c.updated_at.strftime("%d/%m/%Y à %H:%M")
+            = try_format_datetime(c.updated_at)
diff --git a/app/views/shared/dossiers/_identite_entreprise.html.haml b/app/views/shared/dossiers/_identite_entreprise.html.haml
index 87be8390f..33f0ce548 100644
--- a/app/views/shared/dossiers/_identite_entreprise.html.haml
+++ b/app/views/shared/dossiers/_identite_entreprise.html.haml
@@ -22,7 +22,7 @@
       %td= etablissement.naf
     %tr
       %th.libelle Date de création :
-      %td= etablissement.entreprise.date_creation&.strftime("%d/%m/%Y")
+      %td= try_format_date(etablissement.entreprise.date_creation)
     %tr
       %th.libelle Effectif de l'organisation :
       %td= effectif(etablissement)
@@ -64,10 +64,10 @@
         %td= etablissement.association_objet
       %tr
         %th.libelle Date de création :
-        %td= etablissement.association_date_creation&.strftime("%d/%m/%Y")
+        %td= try_format_date(etablissement.association_date_creation)
       %tr
         %th.libelle Date de publication :
-        %td= etablissement.association_date_publication&.strftime("%d/%m/%Y")
+        %td= try_format_date(etablissement.association_date_publication)
       %tr
         %th.libelle Date de déclaration :
-        %td= etablissement.association_date_declaration&.strftime("%d/%m/%Y")
+        %td= try_format_date(etablissement.association_date_declaration)
diff --git a/app/views/shared/dossiers/_identite_individual.html.haml b/app/views/shared/dossiers/_identite_individual.html.haml
index c1d08eb5d..7f83da051 100644
--- a/app/views/shared/dossiers/_identite_individual.html.haml
+++ b/app/views/shared/dossiers/_identite_individual.html.haml
@@ -12,4 +12,4 @@
     - if individual.birthdate.present?
       %tr
         %th.libelle Date de naissance :
-        %td= individual.birthdate&.strftime("%d/%m/%Y")
+        %td= try_format_date(individual.birthdate)
diff --git a/app/views/shared/dossiers/_pieces_jointes.html.haml b/app/views/shared/dossiers/_pieces_jointes.html.haml
index f547c6f72..c11777fb4 100644
--- a/app/views/shared/dossiers/_pieces_jointes.html.haml
+++ b/app/views/shared/dossiers/_pieces_jointes.html.haml
@@ -23,11 +23,11 @@
                         = link_to pj.content_url, { target: :blank, rel: :noopener } do
                           %span.filename= display_pj_filename(pj)
                           %span
-                            ajoutée le #{pj.created_at.strftime('%d/%m/%Y à %H:%M')}
+                            ajoutée le #{try_format_datetime(pj.created_at)}
         - else
           %td Pièce non fournie
         %td.updated-at
           - if pj
             %span{ class: highlight_if_unseen_class(demande_seen_at, pj.updated_at) }
               modifié le
-              = pj.updated_at.strftime("%d/%m/%Y à %H:%M")
+              = try_format_datetime(pj.updated_at)
diff --git a/app/views/shared/dossiers/_submit_is_over.html.haml b/app/views/shared/dossiers/_submit_is_over.html.haml
index 9d81a8a96..212f6e00f 100644
--- a/app/views/shared/dossiers/_submit_is_over.html.haml
+++ b/app/views/shared/dossiers/_submit_is_over.html.haml
@@ -3,6 +3,6 @@
     .card-title
       Le dépôt de dossier est fermé
     - if dossier.procedure.archived_at.present?
-      Il n'est plus possible de déposer de dossier pour cette démarche en ligne depuis le #{dossier.procedure.archived_at.strftime("%d/%m/%Y")}.
+      Il n'est plus possible de déposer de dossier pour cette démarche en ligne depuis le #{try_format_date(dossier.procedure.archived_at)}.
     - else
       Il n'est plus possible de déposer de dossier pour cette démarche en ligne.
diff --git a/app/views/shared/dossiers/editable_champs/_champ_label.html.haml b/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
index 43c6d2b11..1800c94bb 100644
--- a/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
+++ b/app/views/shared/dossiers/editable_champs/_champ_label.html.haml
@@ -5,7 +5,7 @@
 
   - if champ.updated_at.present? && seen_at.present?
     %span.updated-at{ class: highlight_if_unseen_class(seen_at, champ.updated_at) }
-      = "modifié le #{champ.updated_at.strftime('%d/%m/%Y à %H:%M')}"
+      = "modifié le #{try_format_datetime(champ.updated_at)}"
 
   - if champ.description.present?
     %span.notice= string_to_html(champ.description)
diff --git a/app/views/users/dossiers/etablissement/_infos_association.html.haml b/app/views/users/dossiers/etablissement/_infos_association.html.haml
index 4fe9b8f91..d8afcbdb6 100644
--- a/app/views/users/dossiers/etablissement/_infos_association.html.haml
+++ b/app/views/users/dossiers/etablissement/_infos_association.html.haml
@@ -13,12 +13,12 @@
 
   %li
     Date de création :
-    = etablissement.association_date_creation&.strftime('%d/%m/%Y')
+    = try_format_date(etablissement.association_date_creation)
 
   %li
     Date de déclaration :
-    = etablissement.association_date_declaration&.strftime('%d/%m/%Y')
+    = try_format_date(etablissement.association_date_declaration)
 
   %li
     Date de publication :
-    = etablissement.association_date_publication&.strftime('%d/%m/%Y')
+    = try_format_date(etablissement.association_date_publication)
diff --git a/app/views/users/dossiers/etablissement/_infos_entreprise.html.haml b/app/views/users/dossiers/etablissement/_infos_entreprise.html.haml
index 54f03b486..9667a54bd 100644
--- a/app/views/users/dossiers/etablissement/_infos_entreprise.html.haml
+++ b/app/views/users/dossiers/etablissement/_infos_entreprise.html.haml
@@ -22,7 +22,7 @@
 
   %li
     Date de création :
-    = etablissement.entreprise.date_creation&.strftime('%d/%m/%Y')
+    = try_format_date(etablissement.entreprise.date_creation)
 
   %li
     Effectif organisation :
diff --git a/app/views/users/dossiers/index.html.haml b/app/views/users/dossiers/index.html.haml
index 8d49cd044..9475432c3 100644
--- a/app/views/users/dossiers/index.html.haml
+++ b/app/views/users/dossiers/index.html.haml
@@ -47,7 +47,7 @@
                   = render partial: 'shared/dossiers/status_badge', locals: { dossier: dossier }
               %td.updated-at-col
                 = link_to(url_for_dossier(dossier), class: 'cell-link') do
-                  = dossier.updated_at.strftime("%d/%m/%Y")
+                  = try_format_date(dossier.updated_at)
               %td.action-col.action-col
                 = render partial: 'dossier_actions', locals: { dossier: dossier }
     = paginate(@dossiers)
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 435a8fb0e..a06351dbb 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -249,7 +249,7 @@ fr:
       - vendredi
       - samedi
     formats:
-      default: "%d/%m/%Y"
+      default: "%d %B %Y"
       short: "%e %b"
       long: "%e %B %Y"
   datetime:
@@ -290,6 +290,9 @@ fr:
       x_seconds:
         one: 1 seconde
         other: "%{count} secondes"
+  time:
+    formats:
+      default: "%d %B %Y %R"
   pluralize:
     case:
       zero: dossier
diff --git a/spec/helpers/application_helper_spec.rb b/spec/helpers/application_helper_spec.rb
index 30a7becef..ff70654fd 100644
--- a/spec/helpers/application_helper_spec.rb
+++ b/spec/helpers/application_helper_spec.rb
@@ -17,4 +17,42 @@ describe ApplicationHelper do
       it { is_expected.to be_nil }
     end
   end
+
+  describe "#try_format_date" do
+    subject { try_format_date(date) }
+
+    describe 'try formatting a date' do
+      let(:date) { Date.new(2019, 01, 24) }
+      it { is_expected.to eq("24 janvier 2019") }
+    end
+
+    describe 'try formatting a blank string' do
+      let(:date) { "" }
+      it { is_expected.to eq("") }
+    end
+
+    describe 'try formatting a nil string' do
+      let(:date) { nil }
+      it { is_expected.to eq("") }
+    end
+  end
+
+  describe "#try_format_datetime" do
+    subject { try_format_datetime(datetime) }
+
+    describe 'try formatting 31/01/2019 11:25' do
+      let(:datetime) { Time.zone.local(2019, 01, 31, 11, 25, 00) }
+      it { is_expected.to eq("31 janvier 2019 11:25") }
+    end
+
+    describe 'try formatting a blank string' do
+      let(:datetime) { "" }
+      it { is_expected.to eq("") }
+    end
+
+    describe 'try formatting a nil string' do
+      let(:datetime) { nil }
+      it { is_expected.to eq("") }
+    end
+  end
 end
diff --git a/spec/models/concern/tags_substitution_concern_spec.rb b/spec/models/concern/tags_substitution_concern_spec.rb
index 4b5a1ef21..c6be332c5 100644
--- a/spec/models/concern/tags_substitution_concern_spec.rb
+++ b/spec/models/concern/tags_substitution_concern_spec.rb
@@ -238,7 +238,7 @@ describe TagsSubstitutionConcern, type: :model do
               .update(value: '2017-09-13 09:00')
           end
 
-          it { is_expected.to eq('15/04/2017 2017-09-13 09:00') }
+          it { is_expected.to eq('15 avril 2017 13 septembre 2017 09:00') }
         end
       end
     end
diff --git a/spec/views/shared/dossiers/_demande.html.haml_spec.rb b/spec/views/shared/dossiers/_demande.html.haml_spec.rb
index 4c1a7d796..c1d28dd72 100644
--- a/spec/views/shared/dossiers/_demande.html.haml_spec.rb
+++ b/spec/views/shared/dossiers/_demande.html.haml_spec.rb
@@ -38,7 +38,7 @@ describe 'shared/dossiers/demande.html.haml', type: :view do
       expect(rendered).to include(individual.gender)
       expect(rendered).to include(individual.nom)
       expect(rendered).to include(individual.prenom)
-      expect(rendered).to include(individual.birthdate.strftime("%d/%m/%Y"))
+      expect(rendered).to include(I18n.l(individual.birthdate))
     end
   end