diff -r 16d47bd81d84 -r 3f89629b9e54 src/pyams_utils/timezone/__init__.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_utils/timezone/__init__.py	Thu Feb 19 00:46:48 2015 +0100
@@ -0,0 +1,68 @@
+#
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+from datetime import datetime
+
+import pytz
+
+
+# import interfaces
+from pyams_utils.interfaces.timezone import IServerTimezone
+from pyramid.interfaces import IRequest
+from zope.interface.common.idatetime import ITZInfo
+
+# import packages
+from pyams_utils.adapter import adapter_config
+from pyams_utils.registry import query_utility
+
+
+GMT = pytz.timezone('GMT')
+_tz = pytz.timezone('Europe/Paris')
+tz = _tz
+
+
+@adapter_config(context=IRequest, provides=ITZInfo)
+def tzinfo(request=None):
+    """request to timezone adapter
+
+    There is no easy way to get timezone from a request.
+    This adapter assumes that the timezone is given by
+    a registered utility...
+    """
+    util = query_utility(IServerTimezone)
+    if util is not None:
+        return pytz.timezone(util.timezone)
+    return GMT
+
+
+def tztime(value):
+    if not value:
+        return None
+    if not isinstance(value, datetime):
+        return value
+    if not value.tzinfo:
+        value = GMT.localize(value)
+    return value.astimezone(tzinfo())
+
+
+def gmtime(value):
+    if not value:
+        return None
+    if not isinstance(value, datetime):
+        return value
+    if not value.tzinfo:
+        value = GMT.localize(value)
+    return value.astimezone(GMT)