diff --git a/cotisations/migrations/0040_auto_20191002_2335.py b/cotisations/migrations/0040_auto_20191002_2335.py
new file mode 100644
index 00000000..56c99f69
--- /dev/null
+++ b/cotisations/migrations/0040_auto_20191002_2335.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.23 on 2019-10-02 21:35
+from __future__ import unicode_literals
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('cotisations', '0039_freepayment'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='article',
+            name='duration_days',
+            field=models.PositiveIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(0)], verbose_name='duration (in days, will be added to duration in months)'),
+        ),
+        migrations.AddField(
+            model_name='vente',
+            name='duration_days',
+            field=models.PositiveIntegerField(blank=True, null=True, validators=[django.core.validators.MinValueValidator(0)], verbose_name='duration (in days, will be added to duration in months)'),
+        ),
+    ]
diff --git a/cotisations/models.py b/cotisations/models.py
index 3cb64ec3..b9d01b8d 100644
--- a/cotisations/models.py
+++ b/cotisations/models.py
@@ -460,6 +460,12 @@ class Vente(RevMixin, AclMixin, models.Model):
         null=True,
         verbose_name=_("duration (in months)")
     )
+    duration_days = models.PositiveIntegerField(
+        blank=True,
+        null=True,
+        validators=[MinValueValidator(0)],
+        verbose_name=_("duration (in days, will be added to duration in months)")
+    )
     # TODO : this field is not needed if you use Article ForeignKey
     type_cotisation = models.CharField(
         choices=COTISATION_TYPE,
@@ -492,7 +498,9 @@ class Vente(RevMixin, AclMixin, models.Model):
         if hasattr(self, 'cotisation'):
             cotisation = self.cotisation
             cotisation.date_end = cotisation.date_start + relativedelta(
-                months=self.duration*self.number)
+                months=(self.duration or 0)*self.number,
+                days=(self.duration_days or 0)*self.number,
+            )
         return
 
     def create_cotis(self, date_start=False):
@@ -529,7 +537,8 @@ class Vente(RevMixin, AclMixin, models.Model):
             date_max = max(end_cotisation, date_start)
             cotisation.date_start = date_max
             cotisation.date_end = cotisation.date_start + relativedelta(
-                months=self.duration*self.number
+                months=(self.duration or 0)*self.number,
+                days=(self.duration_days or 0)*self.number,
             )
         return
 
@@ -540,7 +549,7 @@ class Vente(RevMixin, AclMixin, models.Model):
         effect on the user's cotisation
         """
         # Checking that if a cotisation is specified, there is also a duration
-        if self.type_cotisation and not self.duration:
+        if self.type_cotisation and not (self.duration or self.duration_days):
             raise ValidationError(
                 _("Duration must be specified for a subscription.")
             )
@@ -695,6 +704,12 @@ class Article(RevMixin, AclMixin, models.Model):
         validators=[MinValueValidator(0)],
         verbose_name=_("duration (in months)")
     )
+    duration_days = models.PositiveIntegerField(
+        blank=True,
+        null=True,
+        validators=[MinValueValidator(0)],
+        verbose_name=_("duration (in days, will be added to duration in months)")
+    )
     type_user = models.CharField(
         choices=USER_TYPES,
         default='All',
@@ -729,7 +744,7 @@ class Article(RevMixin, AclMixin, models.Model):
             raise ValidationError(
                 _("Balance is a reserved article name.")
             )
-        if self.type_cotisation and not self.duration:
+        if self.type_cotisation and not (self.duration or self.duration_days):
             raise ValidationError(
                 _("Duration must be specified for a subscription.")
             )
diff --git a/cotisations/templates/cotisations/aff_article.html b/cotisations/templates/cotisations/aff_article.html
index df187abb..7ead24dc 100644
--- a/cotisations/templates/cotisations/aff_article.html
+++ b/cotisations/templates/cotisations/aff_article.html
@@ -34,6 +34,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
             <th>{% trans "Price" %}</th>
             <th>{% trans "Subscription type" %}</th>
             <th>{% trans "Duration (in months)" %}</th>
+            <th>{% trans "Duration (in days)" %}</th>
             <th>{% trans "Concerned users" %}</th>
             <th>{% trans "Available for everyone" %}</th>
             <th></th>
@@ -45,6 +46,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
         <td>{{ article.prix }}</td>
         <td>{{ article.type_cotisation }}</td>
         <td>{{ article.duration }}</td>
+        <td>{{ article.duration_days }}</td>
         <td>{{ article.type_user }}</td>
         <td>{{ article.available_for_everyone | tick }}</td>
         <td class="text-right">
diff --git a/cotisations/views.py b/cotisations/views.py
index 437d5df1..2a262704 100644
--- a/cotisations/views.py
+++ b/cotisations/views.py
@@ -139,6 +139,7 @@ def new_facture(request, user, userid):
                         prix=article.prix,
                         type_cotisation=article.type_cotisation,
                         duration=article.duration,
+                        duration_days=article.duration_days,
                         number=quantity
                     )
                     purchases.append(new_purchase)