diff --git a/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java b/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
index 6fb21d3..30c9f04 100644
--- a/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
+++ b/src/main/java/de/jeyp91/googlecalendar/TippligaGoogleEventManager.java
@@ -7,7 +7,10 @@ import com.google.api.services.calendar.model.EventDateTime;
 import com.google.api.services.calendar.model.EventReminder;
 import com.google.api.services.calendar.model.Events;
 import de.jeyp91.tippliga.TLWLeague;
+import de.jeyp91.tippliga.TLWMatch;
 import de.jeyp91.tippliga.TLWMatchday;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 import java.io.IOException;
 import java.time.LocalDateTime;
@@ -22,6 +25,7 @@ import static de.jeyp91.googlecalendar.GoogleCalendarConnector.getSerivce;
 public class TippligaGoogleEventManager {
 
     private static List<Event> allEvents = null;
+    private static final Logger logger = LogManager.getLogger(TippligaGoogleEventManager.class);
 
     public static List<Event> getAllEvents(Integer season) {
         if(allEvents == null) {
@@ -75,7 +79,11 @@ public class TippligaGoogleEventManager {
             createNewEvent(matchday, deliveryDateString, deliverDateNumber);
         }
         else {
-            updateEvent(event, matchday, deliveryDateString, deliverDateNumber);
+            String googleEventStart = event.getStart().getDateTime().toString();
+            String googleEventStartBeautified = googleEventStart.substring(0, 19).replace("T", " ");
+            if(!googleEventStartBeautified.equals(deliveryDateString)) {
+                updateEvent(event, matchday, deliveryDateString, deliverDateNumber);
+            }
         }
     }
 
@@ -85,6 +93,7 @@ public class TippligaGoogleEventManager {
         Event event = getEvent(matchday, deliveryDateString, deliverDateNumber);
 
         try {
+            logger.info("Create new google calendar event for " + matchday.getSeason() + ", " + matchday.getLeague() + ", " + matchday.getMatchday() + ", " + deliverDateNumber);
             getSerivce().events().insert(calendarUrl, event).execute();
         } catch (IOException e) {
             e.printStackTrace();
@@ -97,6 +106,7 @@ public class TippligaGoogleEventManager {
         Event event = getEvent(matchday, deliveryDateString, deliverDateNumber);
 
         try {
+            logger.info("Update google calendar event for " + matchday.getSeason() + ", " + matchday.getLeague() + ", " + matchday.getMatchday() + ", " + deliverDateNumber);
             Calendar.Events events = getSerivce().events();
             events.update(calendarUrl, oldEvent.getId(), event).execute();
         } catch (IOException e) {
@@ -110,6 +120,7 @@ public class TippligaGoogleEventManager {
         Event event = findEvent(getAllEvents(matchday.getSeason()), matchday.getSeason(), matchday.getLeague(), matchday.getMatchday(), deliverDateNumber);
         if(event != null) {
             try {
+                logger.info("Delete google calendar event for " + matchday.getSeason() + ", " + matchday.getLeague() + ", " + matchday.getMatchday() + ", " + deliverDateNumber);
                 getSerivce().events().delete(calendarUrl, event.getId()).execute();
             } catch (IOException e) {
                 e.printStackTrace();
@@ -117,6 +128,14 @@ public class TippligaGoogleEventManager {
         }
     }
 
+    public static void deleteAllEvents(int season) throws IOException {
+        String calendarUrl = CalendarConfigProvider.getCalendarUrl();
+        List<Event> events = getAllEvents(season);
+        for(Event event : events ) {
+            getSerivce().events().delete(calendarUrl, event.getId()).execute();
+        }
+    }
+
     private static Event getEvent(TLWMatchday matchday, String deliveryDateString, Integer deliverDateNumber) {
         String matchdayName = matchday.getMatchdayName().equals("") ? matchday.getMatchday().toString() + ". Spieltag" : matchday.getMatchdayName();
         String summary = TLWLeague.getLeagueNameCalendar(matchday.getLeague()) + " " + matchdayName + " tippen!";
diff --git a/src/test/java/de/jeyp91/googlecalendar/TippligaGoogleEventManagerTest.java b/src/test/java/de/jeyp91/googlecalendar/TippligaGoogleEventManagerTest.java
index 77cb64d..1a9573f 100644
--- a/src/test/java/de/jeyp91/googlecalendar/TippligaGoogleEventManagerTest.java
+++ b/src/test/java/de/jeyp91/googlecalendar/TippligaGoogleEventManagerTest.java
@@ -6,6 +6,7 @@ import de.jeyp91.tippliga.TLWMatchday;
 import de.jeyp91.tippliga.TLWMatchdaysCreator;
 import org.junit.Test;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 
@@ -94,4 +95,9 @@ public class TippligaGoogleEventManagerTest {
             TippligaGoogleEventManager.deleteEvent(tlwMatchday, 3);
         });
     }
+
+    @Test
+    public void deleteAllEventsTest() throws IOException {
+        TippligaGoogleEventManager.deleteAllEvents(2023);
+    }
 }