diff --git a/billard/admin.py b/billard/admin.py
index 943a5f6..062d815 100644
--- a/billard/admin.py
+++ b/billard/admin.py
@@ -57,5 +57,8 @@ class DeskAdmin(admin.ModelAdmin):
 
 @admin.register(Accounting)
 class AccountingAdmin(admin.ModelAdmin):
-    list_display = ('desk', 'time_from', 'time_to', 'prize', 'billed', 'account_user')
-    list_filter = ('desk__client__location', 'account_user', 'billed')
+    list_display = ('desk', 'time_from', 'time_to', 'prize', 'billed', 'account_user', 'account_tst')
+    list_filter = ('desk__client__location', 'account_user', 'account_tst', 'billed')
+
+    def has_add_permission(self, request):
+        return False
diff --git a/billard/migrations/0023_accounting_account_tst.py b/billard/migrations/0023_accounting_account_tst.py
new file mode 100644
index 0000000..7fe5c71
--- /dev/null
+++ b/billard/migrations/0023_accounting_account_tst.py
@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11 on 2017-04-29 11:09
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('billard', '0022_auto_20170427_0835'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='accounting',
+            name='account_tst',
+            field=models.DateTimeField(blank=True, null=True, verbose_name='Abr. TST'),
+        ),
+    ]
diff --git a/billard/models.py b/billard/models.py
index 0a7e356..65d6875 100644
--- a/billard/models.py
+++ b/billard/models.py
@@ -86,6 +86,7 @@ class Accounting(models.Model):
     prize_normal = models.DecimalField(max_digits=5, decimal_places=2, blank=True, null=True, verbose_name="Preis Normalzeit")
     prize_hh = models.DecimalField(max_digits=5, decimal_places=2, blank=True, null=True, verbose_name="Preis Happy Hour")
     account_user = models.CharField(blank=True, null=True, max_length=128, verbose_name="Abr. Benutzer")
+    account_tst = models.DateTimeField(blank=True, null=True, verbose_name="Abr. TST")
 
     def __str__(self):
         return '{}: {} -> {}, {}, {}'.format(self.desk, self.time_from, self.time_to, self.prize, self.billed)
diff --git a/billard/views.py b/billard/views.py
index d2db1f6..087fef1 100644
--- a/billard/views.py
+++ b/billard/views.py
@@ -7,9 +7,10 @@ from rest_framework import viewsets
 from django.shortcuts import render, redirect
 from django.views import generic
 from django.contrib.auth.decorators import login_required, permission_required
-from django.db.models import Min, Sum
+from django.db.models import Sum
 from django.http import HttpResponse
 from django.utils.decorators import method_decorator
+from django.utils import timezone
 
 
 class LocationIndexView(generic.ListView):
@@ -64,6 +65,7 @@ def accounting_confirm(request, pk):
             if len(acc_ids) > 0:
                 Accounting.objects.filter(id__in=acc_ids).update(billed=True)
                 Accounting.objects.filter(id__in=acc_ids).update(account_user=request.user.username)
+                Accounting.objects.filter(id__in=acc_ids).update(account_tst=timezone.now())
     resp = redirect('billard:accounting_detail', pk=pk)
     return resp