diff -r 33fdb6f8164c -r 80ce81208b08 server/python/django2/renkanmanager/migrations/0008_modification_date_migrate_data.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/server/python/django2/renkanmanager/migrations/0008_modification_date_migrate_data.py	Tue Jun 21 10:30:08 2016 +0200
@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.4 on 2016-06-21 08:09
+from __future__ import unicode_literals
+
+import json
+
+from django.db import migrations
+
+def adjust_rev_modification_date(apps, schema_editor):
+    Revision = apps.get_model('renkanmanager', 'Revision')
+
+    for rev in Revision.objects.all():
+        content =  json.loads(rev.content)
+        if rev.modification_date:
+            content['updated'] = rev.modification_date.isoformat(' ')
+            rev.content = json.dumps(content)
+            rev.save()
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('renkanmanager', '0007_foreign_key_final'),
+    ]
+
+    operations = [
+        migrations.RunPython(adjust_rev_modification_date)
+    ]