diff --git a/base_usability/__init__.py b/base_usability/__init__.py
index a0c9233..1baafee 100644
--- a/base_usability/__init__.py
+++ b/base_usability/__init__.py
@@ -3,3 +3,4 @@
 from . import partner
 from . import mail
 from . import misc
+from . import ir_sequence
diff --git a/base_usability/ir_sequence.py b/base_usability/ir_sequence.py
new file mode 100644
index 0000000..1d7f014
--- /dev/null
+++ b/base_usability/ir_sequence.py
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    Base Usability module for Odoo
+#    Copyright (C) 2016 Akretion (http://www.akretion.com)
+#    @author Alexis de Lattre <alexis.delattre@akretion.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+from openerp import models, fields
+from datetime import datetime
+import pytz
+
+
+class IrSequence(models.Model):
+    _inherit = 'ir.sequence'
+
+    def _interpolation_dict_context(self, context=None):
+        if context is None:
+            context = {}
+        t = False
+        if context.get('force_sequence_date'):
+            date_str = context['force_sequence_date']
+            if isinstance(date_str, (str, unicode)) and len(date_str) == 10:
+                t = fields.Date.from_string(date_str)
+        if not t:
+            t = datetime.now(pytz.timezone(context.get('tz') or 'UTC'))
+        sequences = {
+            'year': '%Y', 'month': '%m', 'day': '%d', 'y': '%y', 'doy': '%j',
+            'woy': '%W',
+            'weekday': '%w', 'h24': '%H', 'h12': '%I', 'min': '%M', 'sec': '%S'
+        }
+        return {
+            key: t.strftime(sequence)
+            for key, sequence in sequences.iteritems()}