diff --git a/SOPE/NGCards/ChangeLog b/SOPE/NGCards/ChangeLog
index 3ddc72939..5e6348e4f 100644
--- a/SOPE/NGCards/ChangeLog
+++ b/SOPE/NGCards/ChangeLog
@@ -1,3 +1,9 @@
+2007-12-12  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
+
+	* iCalTimeZone.m ([iCalTimeZone -periodForDate:date]): at least
+	one timezone period is needed so we might need to fallback on the
+	only one present if the other does not exist.
+
 2007-11-29  Wolfgang Sourdeau  <wsourdeau@inverse.ca>
 
 	* iCalDateTime.m ([iCalDateTime -timeZone]): log a message if the
diff --git a/SOPE/NGCards/iCalTimeZone.m b/SOPE/NGCards/iCalTimeZone.m
index 0e2e56be4..cd7afbe97 100644
--- a/SOPE/NGCards/iCalTimeZone.m
+++ b/SOPE/NGCards/iCalTimeZone.m
@@ -89,13 +89,18 @@
                             forDate: date];
   standardOccurence = [self _occurenceForPeriodNamed: @"standard"
                             forDate: date];
-  if ([date earlierDate: daylightOccurence] == date
-      || [date earlierDate: standardOccurence] == standardOccurence)
+
+  if (!standardOccurence)
+    period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"daylight"];
+  else if (!daylightOccurence)
+    period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"standard"];
+  else if ([date earlierDate: daylightOccurence] == date
+	   || [date earlierDate: standardOccurence] == standardOccurence)
     period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"standard"];
   else
     period = (iCalTimeZonePeriod *) [self uniqueChildWithTag: @"daylight"];
 
-  NSLog (@"chosen period: '%@'", [period tag]);
+//   NSLog (@"chosen period: '%@'", [period tag]);
 
   return period;
 }