diff -r 000000000000 -r 712d20d2751e ztfy/utils/date.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ztfy/utils/date.py	Sat Jan 10 00:35:35 2009 +0100
@@ -0,0 +1,78 @@
+##############################################################################
+#
+# Copyright (c) 2008 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.
+#
+##############################################################################
+"""
+
+$Id: $
+"""
+
+__version__   = "$Revision: $"
+__release__   = "$Id: $"
+__docformat__ = "restructuredtext"
+ 
+# import standard packages
+from datetime import datetime
+
+# import Zope3 interfaces
+
+# import local interfaces
+
+# import Zope3 packages
+from zope.datetime import parseDatetimetz
+
+# import local packages
+from timezone import gmtime
+
+
+def unidate(value):
+    """Get specified date converted to unicode ISO format
+    
+    Dates are always assumed to be stored in GMT timezone
+    
+    @param value: input date to convert to unicode
+    @type value: date or datetime
+    @return: input date converted to unicode
+    @rtype: unicode
+    """
+    if value is not None:
+        value = gmtime(value)
+        return unicode(value.isoformat('T'),'ascii')
+    return None
+
+
+def parsedate(value):
+    """Get date specified in unicode ISO format to Python datetime object
+    
+    Dates are always assumed to be stored in GMT timezone
+    
+    @param value: unicode date to be parsed
+    @type value: unicode
+    @return: the specified value, converted to datetime
+    @rtype: datetime
+    """
+    if value is not None:
+        return gmtime(parseDatetimetz(value))
+    return None
+
+
+def datetodatetime(value):
+    """Get datetime value converted from a date or datetime object
+    
+    @param value: a date or datetime value to convert
+    @type value: date or datetime
+    @return: input value converted to datetime
+    @rtype: datetime
+    """
+    if type(value) is datetime:
+        return value
+    return datetime(value.year, value.month, value.day)