diff --git a/index.php b/index.php
index 4573d8d9868f489c6e410e4b02854700dbe1536e..b20577d669cf5a4e96d45f79e5c60258ac92da9c 100644
--- a/index.php
+++ b/index.php
@@ -94,5 +94,12 @@
             print $e->getMessage();
         }
     ?>
+
+
+    <h1>Function 7</h1>
+    <?php
+        print "<h2>Разница дней: </h2>";
+        print $func->diffDays(new DateTimeImmutable(), new DateTimeImmutable("2025-01-01"));
+    ?>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/Functions.php b/src/Functions.php
index f7b52aa43644e535ee393f3fc3973a396378c55e..aca1d299d3aca876d91a9ee0b41ea82750768726 100644
--- a/src/Functions.php
+++ b/src/Functions.php
@@ -169,5 +169,17 @@ class Functions
             yield new DateTimeImmutable($day->format("Y-m-d"));
         }
     }
+
+    /**
+     * Вернет кол-во дней между датами
+     * @param DateTimeImmutable $dateStart дата начала
+     * @param DateTimeImmutable $dateEnd дата окончания
+     * @return int
+     */
+    public function diffDays(DateTimeImmutable $dateStart, DateTimeImmutable $dateEnd): int
+    {
+        $dateInterval = date_diff($dateStart, $dateEnd);
+        return (int)$dateInterval->format("%a") ;
+    }
 }