diff --git a/src/main/java/de/hmmh/pmt/db/Project.java b/src/main/java/de/hmmh/pmt/db/Project.java
index 9c9891f..c66731a 100644
--- a/src/main/java/de/hmmh/pmt/db/Project.java
+++ b/src/main/java/de/hmmh/pmt/db/Project.java
@@ -19,7 +19,7 @@ import java.time.LocalDateTime;
 @Table(name = "project")
 public class Project {
     @Id
-    @GeneratedValue(strategy =  GenerationType.IDENTITY)
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
 
     @NotBlank
@@ -43,5 +43,10 @@ public class Project {
     private LocalDateTime plannedEnd;
 
     private LocalDateTime realEnd; // Cant be named just "end" because it's and SQL Keyword
+
+
+    public boolean isValid() {
+        return plannedEnd.isAfter(start) && (realEnd == null || realEnd.isAfter(start));
+    }
 }