diff --git a/src/main/java/de/hmmh/pmt/ApiController.java b/src/main/java/de/hmmh/pmt/ApiController.java
index 6c57d91..19d7356 100644
--- a/src/main/java/de/hmmh/pmt/ApiController.java
+++ b/src/main/java/de/hmmh/pmt/ApiController.java
@@ -9,6 +9,7 @@ import de.hmmh.pmt.employee.api.EmployeeControllerApi;
 import de.hmmh.pmt.employee.dtos.EmployeeResponseDTO;
 import de.hmmh.pmt.oas.DefaultApi;
 import de.hmmh.pmt.util.Mapper;
+import de.hmmh.pmt.util.Validator;
 import jakarta.servlet.http.HttpServletRequest;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
@@ -30,6 +31,10 @@ public class ApiController implements DefaultApi {
     @Autowired
     private ApiClientFactory apiClientFactory;
     @Autowired
+    private Validator validator;
+    @Autowired
+    private ApiTools apiTools;
+    @Autowired
     private ProjectRepository projectRepository;
     @Autowired
     AllocationRepository allocationRepository;
@@ -87,7 +92,7 @@ public class ApiController implements DefaultApi {
         }
 
         Project project = mapper.map(body);
-        if (!project.isValid()) {
+        if (!validator.isValidProject(project)) {
             return new ResponseEntity<>(HttpStatus.UNPROCESSABLE_ENTITY);
         }
         projectRepository.save(project);
@@ -121,16 +126,11 @@ public class ApiController implements DefaultApi {
             return new ResponseEntity<>(HttpStatus.UNPROCESSABLE_ENTITY);
         }
 
-        long start = project.getStart().toEpochSecond(ZoneOffset.UTC);
-        long plannedEnd = project.getPlannedEnd().toEpochSecond(ZoneOffset.UTC);
-        List<Allocation> allocations = allocationRepository.findAllByEmployeeId(body.getEmployeeId());
-        if (allocations.stream()
-                .map(Allocation::getProject)
-                .anyMatch(allocatedProject -> {
-                    long allocatedStart = allocatedProject.getStart().toEpochSecond(ZoneOffset.UTC);
-                    long allocatedPlannedEnd = allocatedProject.getPlannedEnd().toEpochSecond(ZoneOffset.UTC);
-                    return Math.max(start, allocatedStart) <= Math.min(plannedEnd, allocatedPlannedEnd);
-                })) {
+        if (validator.areAllocationTimeRangesOverlapping(
+                project.getStart(),
+                project.getPlannedEnd(),
+                allocationRepository.findAllByEmployeeId(body.getEmployeeId())
+        )) {
             return new ResponseEntity<>(HttpStatus.UNPROCESSABLE_ENTITY);
         }
 
diff --git a/src/main/java/de/hmmh/pmt/db/Project.java b/src/main/java/de/hmmh/pmt/db/Project.java
index 0a70189..2f973e6 100644
--- a/src/main/java/de/hmmh/pmt/db/Project.java
+++ b/src/main/java/de/hmmh/pmt/db/Project.java
@@ -47,16 +47,4 @@ public class Project {
     private LocalDateTime plannedEnd;
 
     private LocalDateTime realEnd; // Cant be named just "end" because it's and SQL Keyword
-
-
-    public boolean isValid() {
-        Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
-        Set<ConstraintViolation<Project>> violations = validator.validate(this);
-
-        return violations.isEmpty() &&
-               plannedEnd.isAfter(start) &&
-               (realEnd == null || realEnd.isAfter(start));
-    }
-
 }
-
diff --git a/src/main/java/de/hmmh/pmt/util/Validator.java b/src/main/java/de/hmmh/pmt/util/Validator.java
new file mode 100644
index 0000000..f496d56
--- /dev/null
+++ b/src/main/java/de/hmmh/pmt/util/Validator.java
@@ -0,0 +1,48 @@
+package de.hmmh.pmt.util;
+
+import de.hmmh.pmt.db.Allocation;
+import de.hmmh.pmt.db.Project;
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.Validation;
+import org.springframework.stereotype.Component;
+
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.util.List;
+import java.util.Set;
+
+@Component
+public class Validator {
+
+    public boolean isValidProject(Project project) {
+        jakarta.validation.Validator validator = Validation
+                .buildDefaultValidatorFactory()
+                .getValidator();
+        Set<ConstraintViolation<Project>> violations = validator.validate(project);
+
+        LocalDateTime start = project.getStart();
+        LocalDateTime plannedEnd = project.getPlannedEnd();
+        LocalDateTime realEnd = project.getRealEnd();
+
+        return violations.isEmpty() &&
+                plannedEnd.isAfter(start) &&
+                (realEnd == null || realEnd.isAfter(start));
+    }
+
+    public boolean areAllocationTimeRangesOverlapping(
+            LocalDateTime start,
+            LocalDateTime plannedEnd,
+            List<Allocation> allocations
+    ){
+        long startUnix = start.toEpochSecond(ZoneOffset.UTC);
+        long plannedEndUnix = plannedEnd.toEpochSecond(ZoneOffset.UTC);
+        return allocations.stream()
+                .map(Allocation::getProject)
+                .anyMatch(allocatedProject -> {
+                    long allocatedStart = allocatedProject.getStart().toEpochSecond(ZoneOffset.UTC);
+                    long allocatedPlannedEnd = allocatedProject.getPlannedEnd().toEpochSecond(ZoneOffset.UTC);
+                    return Math.max(startUnix, allocatedStart) <= Math.min(plannedEndUnix, allocatedPlannedEnd);
+                });
+    }
+
+}