4 files changed, 33 insertions, 12 deletions
diff --git a/main/src/cgeo/calendar/CalendarAddon.java b/main/src/cgeo/calendar/CalendarAddon.java
index c5bb0a6..cce6bf7 100644
--- a/main/src/cgeo/calendar/CalendarAddon.java
+++ b/main/src/cgeo/calendar/CalendarAddon.java
@@ -32,6 +32,7 @@ public class CalendarAddon {
         final Resources res = activity.getResources();
         if (CalendarAddon.isAvailable()) {
             final Date hiddenDate = cache.getHiddenDate();
+            final String startTime = cache.guessEventTimeMinutes() >= 0 ? String.valueOf(cache.guessEventTimeMinutes()) : StringUtils.EMPTY;
             final Parameters params = new Parameters(
                     ICalendar.PARAM_NAME, cache.getName(),
                     ICalendar.PARAM_NOTE, StringUtils.defaultString(cache.getPersonalNote()),
@@ -40,7 +41,7 @@ public class CalendarAddon {
                     ICalendar.PARAM_COORDS, cache.getCoords() == null ? "" : cache.getCoords().format(GeopointFormatter.Format.LAT_LON_DECMINUTE_RAW),
                     ICalendar.PARAM_LOCATION, StringUtils.defaultString(cache.getLocation()),
                     ICalendar.PARAM_SHORT_DESC, StringUtils.defaultString(cache.getShortDescription()),
-                    ICalendar.PARAM_START_TIME_MINUTES, StringUtils.defaultString(cache.guessEventTimeMinutes())
+                    ICalendar.PARAM_START_TIME_MINUTES, startTime
                     );
 
             activity.startActivity(new Intent(ICalendar.INTENT,
diff --git a/main/src/cgeo/geocaching/Geocache.java b/main/src/cgeo/geocaching/Geocache.java
index 8e9485e..83a6d6e 100644
--- a/main/src/cgeo/geocaching/Geocache.java
+++ b/main/src/cgeo/geocaching/Geocache.java
@@ -1631,10 +1631,9 @@ public class Geocache implements IWaypoint {
      *
      * @return start time in minutes after midnight
      */
-    @Nullable
-    public String guessEventTimeMinutes() {
+    public int guessEventTimeMinutes() {
         if (!isEventCache()) {
-            return null;
+            return -1;
         }
 
         final String hourLocalized = CgeoApplication.getInstance().getString(R.string.cache_time_full_hours);
@@ -1660,14 +1659,14 @@ public class Geocache implements IWaypoint {
                         minutes = Integer.parseInt(matcher.group(2));
                     }
                     if (hours >= 0 && hours < 24 && minutes >= 0 && minutes < 60) {
-                        return String.valueOf(hours * 60 + minutes);
+                        return hours * 60 + minutes;
                     }
                 } catch (final NumberFormatException ignored) {
                     // cannot happen, but static code analysis doesn't know
                 }
             }
         }
-        return null;
+        return -1;
     }
 
     public boolean hasStaticMap() {
diff --git a/main/src/cgeo/geocaching/sorting/DateComparator.java b/main/src/cgeo/geocaching/sorting/DateComparator.java
index af50213..347eb44 100644
--- a/main/src/cgeo/geocaching/sorting/DateComparator.java
+++ b/main/src/cgeo/geocaching/sorting/DateComparator.java
@@ -17,13 +17,8 @@ class DateComparator extends AbstractCacheComparator {
         final Date date2 = cache2.getHiddenDate();
         if (date1 != null && date2 != null) {
             final int dateDifference = date1.compareTo(date2);
-            // for equal dates, sort by distance
             if (dateDifference == 0) {
-                final ArrayList<Geocache> list = new ArrayList<>();
-                list.add(cache1);
-                list.add(cache2);
-                final DistanceComparator distanceComparator = new DistanceComparator(Sensors.getInstance().currentGeo().getCoords(), list);
-                return distanceComparator.compare(cache1, cache2);
+                return sortSameDate(cache1, cache2);
             }
             return dateDifference;
         }
@@ -35,4 +30,13 @@ class DateComparator extends AbstractCacheComparator {
         }
         return 0;
     }
+
+    @SuppressWarnings("static-method")
+    protected int sortSameDate(final Geocache cache1, final Geocache cache2) {
+        final ArrayList<Geocache> list = new ArrayList<>();
+        list.add(cache1);
+        list.add(cache2);
+        final DistanceComparator distanceComparator = new DistanceComparator(Sensors.getInstance().currentGeo().getCoords(), list);
+        return distanceComparator.compare(cache1, cache2);
+    }
 }
diff --git a/main/src/cgeo/geocaching/sorting/EventDateComparator.java b/main/src/cgeo/geocaching/sorting/EventDateComparator.java
index 197946a..425ddbb 100644
--- a/main/src/cgeo/geocaching/sorting/EventDateComparator.java
+++ b/main/src/cgeo/geocaching/sorting/EventDateComparator.java
@@ -1,5 +1,7 @@
 package cgeo.geocaching.sorting;
 
+import cgeo.geocaching.Geocache;
+
 /**
  * Compares caches by date. Used only for event caches.
  */
@@ -7,4 +9,19 @@ public class EventDateComparator extends DateComparator {
 
     final static public EventDateComparator singleton = new EventDateComparator();
 
+    @Override
+    protected int sortSameDate(final Geocache left, final Geocache right) {
+        return compare(left.guessEventTimeMinutes(), right.guessEventTimeMinutes());
+    }
+
+    /**
+     * copy of {@link Integer#compare(int, int)}, as that is not available on lower API levels
+     *
+     * @param left
+     * @param right
+     * @return
+     */
+    private static int compare(final int left, final int right) {
+        return left < right ? -1 : (left == right ? 0 : 1);
+    }
 }