chore: add utility methods

src/Entity/Assignment.php

@@ -116,8 +116,7 @@ class Assignment implements BlameableEntityInterface, TimestampableEntityInterfa
             ->setPickupDate($assignment->getPickupDate())
             ->setPickup($assignment->getPickup())
             ->setBenefits($assignment->getBenefits())
-            ->setContact($assignment->getContact())
+            ->setContact($assignment->getContact());
-        ;
 
         $assignment->getFees()->map(function (Fee $fee) use ($instance) {
             $instance->addFee($fee);
@@ -224,6 +223,24 @@ class Assignment implements BlameableEntityInterface, TimestampableEntityInterfa
         return null;
     }
 
+    public function getEffectiveDateFrom(): ?\DateTimeImmutable
+    {
+        if (null !== $effectivePeriod = $this->getEffectivePeriod()) {
+            return $effectivePeriod->start->toDateTimeImmutable();
+        }
+
+        return null;
+    }
+
+    public function getEffectiveDateTo(): ?\DateTimeImmutable
+    {
+        if (null !== $effectivePeriod = $this->getEffectivePeriod()) {
+            return $effectivePeriod->end->toDateTimeImmutable();
+        }
+
+        return null;
+    }
+
     public function getEffectivePickupDate(): ?\DateTimeImmutable
     {
         if (null !== $this->pickupDate) {