sort invoice items by date before passing to template (#4495)

src/Invoice/Calculator/AbstractCalculator.php

@@ -21,6 +21,19 @@ abstract class AbstractCalculator
      */
     abstract public function getEntries(): array;
 
+    /**
+     * @param array<InvoiceItem> $items
+     * @return array<InvoiceItem>
+     */
+    protected function sortEntries(array $items): array
+    {
+        usort($items, function (InvoiceItem $item1, InvoiceItem $item2) {
+            return $item1->getBegin() <=> $item2->getBegin();
+        });
+
+        return $items;
+    }
+
     abstract public function getId(): string;
 
     public function setModel(InvoiceModel $model): void