diff -up gnome-calendar-3.26.2/src/gcal-utils.c.libical-3.0 gnome-calendar-3.26.2/src/gcal-utils.c
--- gnome-calendar-3.26.2/src/gcal-utils.c.libical-3.0	2017-11-08 16:23:17.481220751 +0100
+++ gnome-calendar-3.26.2/src/gcal-utils.c	2017-11-08 16:25:06.896219238 +0100
@@ -204,14 +204,13 @@ gcal_dup_icaltime (const icaltimetype *d
   if (date == NULL)
     return NULL;
 
-  new_date= g_new (icaltimetype, 1);
+  new_date = g_new0 (icaltimetype, 1);
   new_date->year = date->year;
   new_date->month = date->month;
   new_date->day = date->day;
   new_date->hour = date->hour;
   new_date->minute = date->minute;
   new_date->second = date->second;
-  new_date->is_utc = date->is_utc;
   new_date->is_date = date->is_date;
   new_date->is_daylight = date->is_daylight;
   new_date->zone = date->zone;