diff --git a/app/ModelFilters/DeviceWarningFilter.php b/app/ModelFilters/DeviceWarningFilter.php
index 836a56d..cb002f0 100644
--- a/app/ModelFilters/DeviceWarningFilter.php
+++ b/app/ModelFilters/DeviceWarningFilter.php
@@ -19,4 +19,8 @@ class DeviceWarningFilter extends ModelFilter
     {
         return $this->where('status', $status);
     }
+
+    public function stratTime($startTime){
+        return $this->where('created_at', '>=', $startTime);
+    }
 }