diff --git a/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java b/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
index d77bdfc..ec5aa38 100644
--- a/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
+++ b/buisnesslogic/src/main/java/com/plannaplan/entities/Groups.java
@@ -92,10 +92,11 @@ public class Groups {
 
     public String getTimeString() {
         int minutes = this.getTime() % 60;
+        String hoursString = Integer.toString(this.getTime() / 60);
         String minutesString = Integer.toString(minutes);
         if (minutes < 10) {
             minutesString = "0" + minutesString;
         }
-        return String.format("%o.%s", this.getTime() / 60, minutesString);
+        return String.format("%s.%s", hoursString, minutesString);
     }
 }
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