diff --git a/backend/.idea/workspace.xml b/backend/.idea/workspace.xml
index 3f81d0a..de13d0f 100644
--- a/backend/.idea/workspace.xml
+++ b/backend/.idea/workspace.xml
@@ -4,9 +4,10 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Deploy on docker (not productive yet!)">
+    <list default="true" id="3a869f59-290a-4ab2-b036-a878ce801bc4" name="Changes" comment="Fix deleting tasks">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/services/TaskService.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/core/services/TaskScheduleService.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/core/services/TaskScheduleService.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -558,14 +559,21 @@
       <option name="project" value="LOCAL" />
       <updated>1699803821051</updated>
     </task>
-    <option name="localTasksCounter" value="43" />
+    <task id="LOCAL-00043" summary="Fix deleting tasks">
+      <option name="closed" value="true" />
+      <created>1699805283751</created>
+      <option name="number" value="00043" />
+      <option name="presentableId" value="LOCAL-00043" />
+      <option name="project" value="LOCAL" />
+      <updated>1699805283751</updated>
+    </task>
+    <option name="localTasksCounter" value="44" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
     <option name="version" value="3" />
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="Forget single schedule" />
     <MESSAGE value="Fix marking finished task as overdue" />
     <MESSAGE value="Write simple Testcase for ci/cd" />
     <MESSAGE value="Deactivate Overall System test (temporarly)" />
@@ -590,7 +598,8 @@
     <MESSAGE value="Adapt datetime-picker" />
     <MESSAGE value="Fix wrong date" />
     <MESSAGE value="Deploy on docker (not productive yet!)" />
-    <option name="LAST_COMMIT_MESSAGE" value="Deploy on docker (not productive yet!)" />
+    <MESSAGE value="Fix deleting tasks" />
+    <option name="LAST_COMMIT_MESSAGE" value="Fix deleting tasks" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
@@ -612,7 +621,7 @@
         </line-breakpoint>
         <line-breakpoint enabled="true" type="java-line">
           <url>file://$PROJECT_DIR$/src/main/java/core/services/TaskService.java</url>
-          <line>92</line>
+          <line>93</line>
           <option name="timeStamp" value="35" />
         </line-breakpoint>
       </breakpoints>
diff --git a/backend/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java b/backend/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java
index d70250d..c01dee2 100644
--- a/backend/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java
+++ b/backend/src/main/java/core/api/models/timemanager/taskSchedule/scheduleInfos/AdvancedScheduleFieldInfo.java
@@ -2,40 +2,44 @@ package core.api.models.timemanager.taskSchedule.scheduleInfos;
 
 import com.fasterxml.jackson.annotation.JsonFormat;
 import com.fasterxml.jackson.annotation.JsonProperty;
+import org.springframework.format.annotation.DateTimeFormat;
 
 import javax.validation.constraints.NotNull;
 import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
 
 public class AdvancedScheduleFieldInfo extends ScheduleFieldInfo {
 
     @NotNull
     @JsonProperty
-    private LocalDateTime scheduleStartTime;
+    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+    private ZonedDateTime scheduleStartTime;
     @NotNull
     @JsonProperty
-    private LocalDateTime scheduleStopTime;
+    @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+    private ZonedDateTime scheduleStopTime;
 
     public AdvancedScheduleFieldInfo(LocalDateTime scheduleStartTime, LocalDateTime scheduleStopTime) {
-        this.scheduleStartTime = scheduleStartTime;
-        this.scheduleStopTime = scheduleStopTime;
+        this.scheduleStartTime = ZonedDateTime.from(scheduleStartTime);
+        this.scheduleStopTime = ZonedDateTime.from(scheduleStopTime);
     }
 
     public AdvancedScheduleFieldInfo() {
     }
 
-    public LocalDateTime getScheduleStartTime() {
+    public ZonedDateTime getScheduleStartTime() {
         return scheduleStartTime;
     }
 
-    public void setScheduleStartTime(LocalDateTime scheduleStartTime) {
+    public void setScheduleStartTime(ZonedDateTime scheduleStartTime) {
         this.scheduleStartTime = scheduleStartTime;
     }
 
-    public LocalDateTime getScheduleStopTime() {
+    public ZonedDateTime getScheduleStopTime() {
         return scheduleStopTime;
     }
 
-    public void setScheduleStopTime(LocalDateTime scheduleStopTime) {
+    public void setScheduleStopTime(ZonedDateTime scheduleStopTime) {
         this.scheduleStopTime = scheduleStopTime;
     }
 }
diff --git a/backend/src/main/java/core/services/TaskScheduleService.java b/backend/src/main/java/core/services/TaskScheduleService.java
index 3f970a6..0891a53 100644
--- a/backend/src/main/java/core/services/TaskScheduleService.java
+++ b/backend/src/main/java/core/services/TaskScheduleService.java
@@ -56,7 +56,7 @@ public class TaskScheduleService {
             return new ServiceResult<>(ServiceExitCode.INVALID_PARAMETER);
         }
 
-        AdvancedTaskSchedule advancedTaskSchedule = new AdvancedTaskSchedule(task, scheduleFieldInfo.getScheduleStartTime(), scheduleFieldInfo.getScheduleStopTime());
+        AdvancedTaskSchedule advancedTaskSchedule = new AdvancedTaskSchedule(task, scheduleFieldInfo.getScheduleStartTime().toLocalDateTime(), scheduleFieldInfo.getScheduleStopTime().toLocalDateTime());
         scheduleRepository.save(advancedTaskSchedule);
 
         return new ServiceResult<>(advancedTaskSchedule);
@@ -89,8 +89,8 @@ public class TaskScheduleService {
             return new ServiceResult<>(ServiceExitCode.INVALID_PARAMETER);
         }
 
-        schedule.setScheduleStart(scheduleFieldInfo.getScheduleStartTime());
-        schedule.setScheduleEnd(scheduleFieldInfo.getScheduleStopTime());
+        schedule.setScheduleStart(scheduleFieldInfo.getScheduleStartTime().toLocalDateTime());
+        schedule.setScheduleEnd(scheduleFieldInfo.getScheduleStopTime().toLocalDateTime());
         scheduleRepository.save(schedule);
         return new ServiceResult<>(schedule);
     }