diff --git a/app/index.php b/app/index.php
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..5f4d6befb7051cc98d0d69c00bbe117bb84fe1b0 100644
--- a/app/index.php
+++ b/app/index.php
@@ -0,0 +1,9 @@
+<?php
+
+require_once ('repository/DiffDays.php');
+
+$startDate = new DateTimeImmutable();
+$endDate = (new DateTimeImmutable())->setDate(2025, 12,31);;
+
+echo ("Lней от ".$startDate->format('d-m-y')." до ".$endDate->format('d-m-y')." : ".diffDays($startDate, $endDate));
+
diff --git a/app/repository/DiffDays.php b/app/repository/DiffDays.php
new file mode 100644
index 0000000000000000000000000000000000000000..19cfd90ecfee3b78c0f082336185f8eb56f1f314
--- /dev/null
+++ b/app/repository/DiffDays.php
@@ -0,0 +1,12 @@
+<?php
+
+/**
+ * Вернет кол-во дней между датами
+ * @param DateTimeImmutable $dateStart дата начала
+ * @param DateTimeImmutable $dateEnd дата окончания
+ * @return int
+ * */
+function diffDays(DateTimeImmutable $dateStart, DateTimeImmutable $dateEnd): int {
+    $interval = $dateStart->diff($dateEnd);
+    return $interval->format('%a');
+}
\ No newline at end of file