diff --git a/src/pvv/side/door.php b/src/pvv/side/door.php
index cde184c..c4282b1 100644
--- a/src/pvv/side/door.php
+++ b/src/pvv/side/door.php
@@ -39,7 +39,7 @@ class Door {
     $query
       = 'SELECT time, open FROM door WHERE time > :startTime ORDER BY time DESC';
     $statement = $this->pdo->prepare($query);
-    $statement->bindParam(':startTime', $startTime, \PDO::PARAM_STR);
+    $statement->bindParam(':startTime', $startTime->getTimestamp(), \PDO::PARAM_INT);
     $statement->execute();
 
     $doorEvents = [];
diff --git a/www/door/index.php b/www/door/index.php
index d39831d..e0f0599 100644
--- a/www/door/index.php
+++ b/www/door/index.php
@@ -31,9 +31,13 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $period = (string) htmlspecialchars($_GET['period']);
 
     if ($period == 'day') {
-      $startTime = time() - (60 * 60 * 24);
+      $startTime = (new \DateTimeImmutable())
+        ->setTimestamp(time())
+        ->sub(new \DateInterval('P1D'));
     } elseif ($period == 'week') {
-      $startTime = time() - (60 * 60 * 24 * 7);
+      $startTime = (new \DateTimeImmutable())
+        ->setTimestamp(time())
+        ->sub(new \DateInterval('P1W'));
     } else {
       echo '{"status": "error", "message": "Invalid period"}';
       exit;