diff --git a/eopayment/tipi.py b/eopayment/tipi.py
index d76afe4..abcbafa 100644
--- a/eopayment/tipi.py
+++ b/eopayment/tipi.py
@@ -14,9 +14,12 @@
 # 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/>.
 
+import datetime
 import re
 import random
 
+import pytz
+
 from .common import (PaymentCommon, PaymentResponse, URL, PAID, DENIED,
                      CANCELLED, ERROR, ResponseError)
 from six.moves.urllib.parse import urlencode, parse_qs
@@ -25,8 +28,6 @@ from gettext import gettext as _
 import logging
 import warnings
 
-from .systempayv2 import isonow
-
 __all__ = ['Payment']
 
 TIPI_URL = 'https://www.tipi.budget.gouv.fr/tpa/paiement.web'
@@ -85,7 +86,8 @@ class Payment(PaymentCommon):
     REFDET_RE = re.compile('^[a-zA-Z0-9]{6,30}$')
 
     def _generate_refdet(self):
-        return '%s%010d' % (isonow(), random.randint(1, 1000000000))
+        return '%s%010d' % (datetime.datetime.now(pytz.timezone('Europe/Paris')).strftime('%Y%m%d%H%M%S'),
+                            random.randint(1, 1000000000))
 
     def request(self, amount, next_url=None, exer=None, orderid=None,
                 refdet=None, objet=None, email=None, saisie=None, **kwargs):
diff --git a/tests/test_tipi.py b/tests/test_tipi.py
index 3f525fa..d1b48a3 100644
--- a/tests/test_tipi.py
+++ b/tests/test_tipi.py
@@ -18,6 +18,8 @@ import datetime
 from decimal import Decimal
 from six.moves.urllib.parse import urlparse, parse_qs
 
+import pytz
+
 import eopayment
 import eopayment.tipi
 import pytest
@@ -70,7 +72,7 @@ def test_tipi_no_orderid_no_refdet():
     assert parsed_qs['mel'] == ['info@entrouvert.com']
     assert parsed_qs['numcli'] == ['12345']
     assert parsed_qs['exer'] == ['9999']
-    assert parsed_qs['refdet'][0].startswith(datetime.datetime.now().strftime('%Y%m%d'))
+    assert parsed_qs['refdet'][0].startswith(datetime.datetime.now(pytz.timezone('Europe/Paris')).strftime('%Y%m%d'))
 
 
 def test_tipi_orderid_refdef_compatible():