diff --git a/src/main/java/de/tilman/scripting/FixIcsTimestamps.java b/src/main/java/de/tilman/scripting/FixIcsTimestamps.java
new file mode 100644
index 0000000..a387fc6
--- /dev/null
+++ b/src/main/java/de/tilman/scripting/FixIcsTimestamps.java
@@ -0,0 +1,157 @@
+package de.tilman.scripting;
+
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/*
+#41237 - Chor montags 17:30 ==> lokale Zeitzone, Zielformat
+BEGIN:VEVENT
+DTSTART;TZID=Europe/Berlin:20200914T173000
+DTEND;TZID=Europe/Berlin:20200914T183000
+RRULE:FREQ=WEEKLY;WKST=MO;UNTIL=20210621T215959Z;BYDAY=MO
+DTSTAMP:20200914T174410Z
+UID:6hijie346lh3ib9p6pim6b9k75im2bb2c8rj0bb360q68d9h6gqjed9k6c@google.com
+CREATED:20200911T140024Z
+DESCRIPTION:<font color="#FB8C00">●</font>
+LAST-MODIFIED:20200911T140024Z
+LOCATION:Hardenbergstraße 33
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Anton Staats- und Domchor Probe
+TRANSP:OPAQUE
+END:VEVENT
+
+#36351 Elternabend Jacob 11.3. 17:00-19:00 (Winterzeit) ==> muss konvertiert werden
+BEGIN:VEVENT
+DTSTART:20200311T160000Z
+DTEND:20200311T180000Z
+DTSTAMP:20200914T174410Z
+UID:hrkrr1f67h1a38abhruogfjucdcdvoa03mm9187a22161l95ppftu64u8s@google.com
+CREATED:20200106T155150Z
+DESCRIPTION:<font color="#FB8C00">●</font>
+LAST-MODIFIED:20200106T155151Z
+LOCATION:
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Elternabend Jacob
+TRANSP:OPAQUE
+END:VEVENT
+
+#43692 Geburtstag Moritz 2.10. 14:45-18:30 (Sommerzeit) ==> muss konvertiert werden
+BEGIN:VEVENT
+DTSTART:20201002T124500Z
+DTEND:20201002T163000Z
+DTSTAMP:20200914T174410Z
+UID:svt4q8rt5go36p78rkmtmu3gcs82t82bi5druln2hpq8tp1ldj96m2ea2h@google.com
+CREATED:20200914T141118Z
+DESCRIPTION:<font color="#FB8C00">●</font>
+LAST-MODIFIED:20200914T141119Z
+LOCATION:Dockx 3D Schwarzlicht Minigolf\nOrdensmeisterstr. 1-3
+SEQUENCE:0
+STATUS:CONFIRMED
+SUMMARY:Kindergeburtstag Moritz (Anton)
+TRANSP:OPAQUE
+END:VEVENT
+*/
+
+public class FixIcsTimestamps {
+
+	private final static Logger log = LoggerFactory.getLogger(FixIcsTimestamps.class);
+	
+	SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd'T'HHmmssZ");
+	
+	String filePath = "/home/tilman/Schreibtisch/00 Temp/2019-10-20 Anica Kalender-Archiv/2020-09-14 Kalender-Backup tilman.liero@gmail.com.ical/Familie_tero23q0dqqfc45r4jjcecl7bs@group.calendar.google.com.ics";
+	int counter = 0;
+	int dtval = 0;
+	int utcEntry = 0;
+	int tzEntry = 0;
+	int lineCounter = 1;
+
+	public FixIcsTimestamps() {
+		log.info("Reading file " + filePath);
+		
+		BufferedReader reader;
+		List<String> outLines = new ArrayList<String>();
+		try {
+			reader = new BufferedReader(new FileReader(filePath));
+			String line = reader.readLine();
+			
+			while (line != null) {
+				if (line.equals("BEGIN:VEVENT")) {
+					List<String> appointment = new ArrayList<String>();
+					appointment.add(line);
+					
+					while (!line.equals("END:VEVENT")) {
+						line = reader.readLine();
+						lineCounter++;
+						
+						if (line.startsWith("DTSTART:")) { // UTC, muss konvertiert werden
+							utcEntry++;
+							
+							String startDate = line.substring(8, 24);
+							Date date = dateFormat.parse(startDate.replaceAll("Z$", "+0000"));
+							
+							String convertedStartDate = "DTSTART;TZID=Europe/Berlin:" + dateFormat.format(date).substring(0,15);
+							appointment.add(convertedStartDate);
+							
+							log.info("input " + line + ", converted: " + convertedStartDate);
+						} else if (line.startsWith("DTEND:")) { // UTC, muss konvertiert werden
+							String endDate = line.substring(6, 22);
+							Date date = dateFormat.parse(endDate.replaceAll("Z$", "+0000"));
+							
+							String convertedEndDate = "DTEND;TZID=Europe/Berlin:" + dateFormat.format(date).substring(0,15);
+							appointment.add(convertedEndDate);
+						} else { // no conversion
+							if (line.startsWith("DTSTART;VALUE=DATE:")) { // ganztägiger Termin
+								dtval++;
+							} else if (line.startsWith("DTSTART;TZID=")) { // Local Timezone
+								tzEntry++;
+							}
+
+							appointment.add(line);
+						}
+					}
+					
+					outLines.addAll(appointment);
+					
+					counter++;
+				}
+				else {
+					outLines.add(line);
+				}
+				
+				line = reader.readLine();
+				lineCounter++;
+			}
+			
+			reader.close();
+			
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		
+		log.info("Counter: " + counter);
+		log.info("DTVAL: " + dtval);
+		log.info("UTC: " + utcEntry);
+		log.info("TZ: " + tzEntry);
+		log.info("DTVAL + UTC + TZ = " + (dtval + utcEntry + tzEntry));
+		
+		
+		for (String line : outLines) {
+			System.out.println(line);
+		}
+		
+	}
+	
+	public static void main(String[] args) {
+		new FixIcsTimestamps();
+	}
+
+}