[gnome-calendar/wip/mcatanzaro/timezone: 3/4] event: Restore handling of all day events

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a7304ed9b0bb3e69fc06162ffefb79d6c6ac76d3
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Tue Dec 5 17:36:14 2017 -0600

    event: Restore handling of all day events
    
    This brings back the original handling of all day events that we had
    before I reverted the previous commit.

 src/gcal-event.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)
---
diff --git a/src/gcal-event.c b/src/gcal-event.c
index d9c7fe7..dc60663 100644
--- a/src/gcal-event.c
+++ b/src/gcal-event.c
@@ -225,24 +225,28 @@ build_component_from_datetime (GcalEvent *self,
                                GDateTime *dt)
 {
   ECalComponentDateTime *comp_dt;
-  gchar *tzid;
 
   if (!dt)
     return NULL;
 
   comp_dt = g_new0 (ECalComponentDateTime, 1);
-  comp_dt->value = NULL;
-  comp_dt->tzid = NULL;
-
-  tzid = g_date_time_format (dt, "%Z");
-
   comp_dt->value = datetime_to_icaltime (dt);
-  comp_dt->value->zone = icaltimezone_get_builtin_timezone_from_tzid (tzid);
   comp_dt->value->is_date = self->all_day;
 
-  /* All day events have no timezone */
-  if (!self->all_day)
-    comp_dt->tzid = tzid;
+  if (self->all_day)
+    {
+      comp_dt->value->zone = icaltimezone_get_utc_timezone ();
+      comp_dt->tzid = g_strdup ("UTC");
+    }
+  else
+    {
+      gchar *tzid;
+
+      tzid = g_date_time_format (dt, "%Z");
+      comp_dt->value->zone = icaltimezone_get_builtin_timezone_from_tzid (tzid);
+      /* This transfers ownership of tzid. */
+      comp_dt->tzid = tzid;
+    }
 
   return comp_dt;
 }