diff --git a/accounting/migrations/0012_auto_20160720_1847.py b/accounting/migrations/0012_auto_20160720_1847.py
new file mode 100644
index 00000000..23322935
--- /dev/null
+++ b/accounting/migrations/0012_auto_20160720_1847.py
@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('accounting', '0011_auto_20160718_1805'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='operation',
+            options={'ordering': ['-number']},
+        ),
+        migrations.AddField(
+            model_name='operation',
+            name='number',
+            field=models.IntegerField(default=1, verbose_name='number'),
+            preserve_default=False,
+        ),
+        migrations.AlterUniqueTogether(
+            name='operation',
+            unique_together=set([('number', 'journal')]),
+        ),
+    ]
diff --git a/accounting/models.py b/accounting/models.py
index 7b590e77..616b5352 100644
--- a/accounting/models.py
+++ b/accounting/models.py
@@ -1,7 +1,10 @@
 from django.core.urlresolvers import reverse
+from django.core.exceptions import ValidationError
+from django.db.models import Count
 from django.db import models
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
+from django.template import defaultfilters
 
 from decimal import Decimal
 from core.models import User
@@ -128,6 +131,7 @@ class Operation(models.Model):
     """
     An operation is a line in the journal, a debit or a credit
     """
+    number = models.IntegerField(_('number'))
     journal = models.ForeignKey(GeneralJournal, related_name="operations", null=False)
     amount = CurrencyField(_('amount'))
     date = models.DateField(_('date'))
@@ -139,7 +143,19 @@ class Operation(models.Model):
     done = models.BooleanField(_('is done'), default=False)
     accounting_type = models.ForeignKey('AccountingType', related_name="operations")
 
+    class Meta:
+        unique_together = ('number', 'journal')
+        ordering = ['-number']
+
+    def clean(self):
+        super(Operation, self).clean()
+        if self.date < self.journal.start_date:
+            raise ValidationError(_("""The date can not be before the start date of the journal, which is
+%(start_date)s.""") % {'start_date': defaultfilters.date(self.journal.start_date, settings.DATE_FORMAT)})
+
     def save(self):
+        if self.number is None:
+            self.number = self.journal.operations.count() + 1
         super(Operation, self).save()
         self.journal.update_amounts()
 
diff --git a/accounting/templates/accounting/club_account_details.jinja b/accounting/templates/accounting/club_account_details.jinja
index c2bd5f13..4c0eff9b 100644
--- a/accounting/templates/accounting/club_account_details.jinja
+++ b/accounting/templates/accounting/club_account_details.jinja
@@ -17,6 +17,7 @@
     <p>{% trans %}You can not create new journal while you still have one opened{% endtrans %}</p>
     {% endif %}
     <table>
+        <thead>
         <tr>
             <td>{% trans %}Name{% endtrans %}</td>
             <td>{% trans %}Start{% endtrans %}</td>
@@ -24,7 +25,10 @@
             <td>{% trans %}Amount{% endtrans %}</td>
             <td>{% trans %}Effective amount{% endtrans %}</td>
             <td>{% trans %}Closed{% endtrans %}</td>
+            <td>{% trans %}Actions{% endtrans %}</td>
         </tr>
+        </thead>
+        <tbody>
         {% for j in object.journals.all() %}
         <tr>
             <td>{{ j.name }}</td>
@@ -45,5 +49,6 @@
                 <a href="{{ url('accounting:journal_edit', j_id=j.id) }}">{% trans %}Edit{% endtrans %}</a> </td>
         </tr>
         {% endfor %}
+        </tbody>
     </table>
 {% endblock %}
diff --git a/accounting/templates/accounting/journal_details.jinja b/accounting/templates/accounting/journal_details.jinja
index d08be1b6..ae4286d0 100644
--- a/accounting/templates/accounting/journal_details.jinja
+++ b/accounting/templates/accounting/journal_details.jinja
@@ -15,6 +15,7 @@
     <p><a href="{{ url('accounting:op_new') }}?parent={{ object.id }}">{% trans %}New operation{% endtrans %}</a></p>
     {% endif %}
     <table>
+        <thead>
         <tr>
             <td>{% trans %}Nb{% endtrans %}</td>
             <td>{% trans %}Date{% endtrans %}</td>
@@ -28,9 +29,11 @@
             <td>{% trans %}Comment{% endtrans %}</td>
             <td>{% trans %}Actions{% endtrans %}</td>
         </tr>
+        </thead>
+        <tbody>
         {% for o in object.operations.all() %}
         <tr>
-            <td>{{ o.id }}</td>
+            <td>{{ o.number }}</td>
             <td>{{ o.date }}</td>
             <td>{{ o.label }}</td>
             <td>{{ o.amount }} €</td>
@@ -50,5 +53,6 @@
             </td>
         </tr>
         {% endfor %}
+        </tbody>
     </table>
 {% endblock %}
diff --git a/core/static/core/form.css b/core/static/core/form.css
index 83b926f7..53a37663 100644
--- a/core/static/core/form.css
+++ b/core/static/core/form.css
@@ -180,9 +180,3 @@ select[multiple]
     vertical-align: top;
 }
 
-/* Tables
------------------------------------------------*/
-tbody>tr{
-    display: block;
-    margin: 3px;
-}
diff --git a/core/static/core/style.css b/core/static/core/style.css
index a3a7b5c4..26394f67 100644
--- a/core/static/core/style.css
+++ b/core/static/core/style.css
@@ -111,6 +111,24 @@ ul, ol {
     display: inline-block;
     margin: 4px;
 }
+table {
+    width: 100%;
+}
+td {
+    padding: 4px;
+    border: solid 1px black;
+    border-collapse: collapse;
+}
+thead {
+    font-weight: bold;
+}
+tbody>tr:nth-child(even) {
+    background: lightgrey;
+}
+tbody>tr:hover {
+    background: yellow;
+    width: 100%;
+}
 
 /*-----------------------------USER PROFILE----------------------------*/
 .user_profile {
diff --git a/counter/models.py b/counter/models.py
index 377d4379..3adf2eac 100644
--- a/counter/models.py
+++ b/counter/models.py
@@ -65,7 +65,7 @@ class Product(models.Model):
     icon = models.ImageField(upload_to='products', null=True, blank=True)
     club = models.ForeignKey(Club, related_name="products")
 
-    def is_owned_by(self, user): # TODO do this for all models
+    def is_owned_by(self, user):
         """
         Method to see if that object can be edited by the given user
         """
diff --git a/sith/settings_sample.py b/sith/settings_sample.py
index ac8e8340..43238b23 100644
--- a/sith/settings_sample.py
+++ b/sith/settings_sample.py
@@ -144,9 +144,9 @@ DATABASES = {
 # Internationalization
 # https://docs.djangoproject.com/en/1.8/topics/i18n/
 
-LANGUAGE_CODE = 'en-us'
+LANGUAGE_CODE = 'fr-FR'
 
-TIME_ZONE = 'UTC'
+TIME_ZONE = 'Europe/Paris'
 
 USE_I18N = True