diff --git a/src/jvmMain/kotlin/de/kif/backend/route/CalendarExport.kt b/src/jvmMain/kotlin/de/kif/backend/route/CalendarExport.kt
index f3f7739..2606999 100644
--- a/src/jvmMain/kotlin/de/kif/backend/route/CalendarExport.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/route/CalendarExport.kt
@@ -1,20 +1,44 @@
 package de.kif.backend.route
 
+import biweekly.Biweekly
+import biweekly.ICalendar
+import biweekly.component.VEvent
+import biweekly.util.Duration
 import de.kif.backend.repository.ScheduleRepository
+import de.kif.common.model.Schedule
 import io.ktor.application.call
 import io.ktor.http.ContentType
 import io.ktor.response.respondText
 import io.ktor.routing.Route
 import io.ktor.routing.get
+import java.util.*
 
 
 fun Route.calendarExport() {
     get("export/kif.ics") {
-        val scheduleList = ScheduleRepository.all()
+        val scheduleList: List<Schedule> = ScheduleRepository.all()
 
-        //TODO
-
-        val text = ""
+        val ical = ICalendar()
+        for (scheduleItem in scheduleList) {
+            val event = VEvent()
+            event.setSummary(scheduleItem.workGroup.name)
+            event.setDescription(scheduleItem.workGroup.description)
+            val startTime = scheduleItem.getAbsoluteEndTime()
+            val calendar = Calendar.getInstance()
+            calendar.clear()
+            calendar.set(
+                2019,
+                5,
+                13 + scheduleItem.day,
+                scheduleItem.time / 60,
+                scheduleItem.time % 60
+            )
+            event.setDateStart(Date(calendar.timeInMillis))
+            event.setDuration(Duration.fromMillis(scheduleItem.workGroup.length * 60 * 1000L))
+            event.setLocation(scheduleItem.room.name)
+            ical.addEvent(event)
+        }
+        val text = Biweekly.write(ical).go()
 
         call.respondText(contentType = ContentType.parse("text/calendar"), text = text)
     }