diff --git a/elections/forms.py b/elections/forms.py
index f05237c..3ff80d3 100644
--- a/elections/forms.py
+++ b/elections/forms.py
@@ -1,7 +1,27 @@
 from django import forms
 from django.forms.models import inlineformset_factory
+from django.utils import timezone
+from django.utils.translation import gettext_lazy as _
 
-from .models import Option, Question
+from .models import Election, Option, Question
+
+
+class ElectionCreateForm(forms.ModelForm):
+    def clean(self):
+        cleaned_data = super().clean()
+        if cleaned_data["start_date"] < timezone.now():
+            self.add_error(
+                "start_date", _("Impossible de faire débuter l'élection dans le passé")
+            )
+        elif cleaned_data["start_date"] >= cleaned_data["end_date"]:
+            self.add_error(
+                "end_date", _("Impossible de terminer l'élection avant de la commencer")
+            )
+        return cleaned_data
+
+    class Meta:
+        model = Election
+        fields = ["name", "description", "start_date", "end_date"]
 
 
 class VoteForm(forms.ModelForm):
diff --git a/elections/views.py b/elections/views.py
index f25c07e..6678494 100644
--- a/elections/views.py
+++ b/elections/views.py
@@ -9,7 +9,7 @@ from django.utils.translation import gettext_lazy as _
 from django.views.generic import CreateView, DetailView, RedirectView, UpdateView
 from django.views.generic.detail import SingleObjectMixin
 
-from .forms import OptionFormSet
+from .forms import ElectionCreateForm, OptionFormSet
 from .models import Election, Option, Question
 
 # TODO: access control *everywhere*
@@ -17,9 +17,9 @@ from .models import Election, Option, Question
 
 class ElectionCreateView(SuccessMessageMixin, CreateView):
     model = Election
-    fields = ["name", "description", "start_date", "end_date"]
+    form_class = ElectionCreateForm
     template_name = "elections/election_create.html"
-    success_message = _("Élection crée avec succès !")
+    success_message = _("Élection créée avec succès !")
 
     def get_success_url(self):
         return reverse("election.admin", args=[self.object.pk])
@@ -27,7 +27,7 @@ class ElectionCreateView(SuccessMessageMixin, CreateView):
     def form_valid(self, form):
         # We need to add the short name and the creator od the election
         form.instance.short_name = slugify(
-            str(form.instance.start_date.year) + "_" + form.instance.name
+            form.instance.start_date.strftime("%Y-%m-%d") + "_" + form.instance.name
         )[:50]
         # TODO: Change this if we modify the user model
         form.instance.created_by = self.request.user
@@ -57,8 +57,8 @@ class ElectionUpdateView(SuccessMessageMixin, UpdateView):
         return reverse("election.admin", args=[self.object.pk])
 
     def get_queryset(self):
-        # On ne peut plus modifier une élection déjà comptée
-        return super().get_queryset().filter(tallied=False, archived=False)
+        # On ne peut plus modifier une élection qui a déjà commencé
+        return super().get_queryset().filter(start_date__gt=timezone.now())
 
 
 class ElectionTallyView(SuccessMessageMixin, SingleObjectMixin, RedirectView):
@@ -66,7 +66,12 @@ class ElectionTallyView(SuccessMessageMixin, SingleObjectMixin, RedirectView):
     pattern_name = "election.admin"
 
     def get_queryset(self):
-        return super().get_queryset().prefetch_related("questions__options")
+        return (
+            super()
+            .get_queryset()
+            .filter(end_date__lt=timezone.now())
+            .prefetch_related("questions__options")
+        )
 
     def get(self, request, *args, **kwargs):
         election = self.get_object()
@@ -95,6 +100,9 @@ class ElectionChangePublicationView(
     model = Election
     pattern_name = "election.admin"
 
+    def get_queryset(self):
+        return super().get_queryset().filter(end_date__lt=timezone.now())
+
     def get(self, request, *args, **kwargs):
         election = self.get_object()
         election.results_public = not election.results_public
@@ -112,6 +120,9 @@ class ElectionArchiveView(SuccessMessageMixin, SingleObjectMixin, RedirectView):
     model = Election
     pattern_name = "election.admin"
 
+    def get_queryset(self):
+        return super().get_queryset().filter(end_date__lt=timezone.now())
+
     def get(self, request, *args, **kwargs):
         election = self.get_object()
         election.archived = True
@@ -148,7 +159,12 @@ class VoteView(SuccessMessageMixin, DetailView):
         return (
             super()
             .get_queryset()
-            .filter(election__tallied=False, election__archived=False)
+            .filter(
+                election__tallied=False,
+                election__archived=False,
+                election__start_date__lt=timezone.now(),
+                election__end_date__gt=timezone.now(),
+            )
             .select_related("election")
         )