--- a/app/terminal/model/UploadFile.php
+++ b/app/terminal/model/UploadFile.php
@@ -67,7 +67,7 @@
      * @throws \think\db\exception\DbException
      * @throws \think\db\exception\ModelNotFoundException
      */
-    public function getAll(array $param = []): \think\Collection
+    public function getAll(array $param = []): array
     {
         // 商品列表获取条件
         $params = $this->setQueryDefaultValue($param, [
--- a/app/common/model/SignAction.php
+++ b/app/common/model/SignAction.php
@@ -24,6 +24,17 @@
     // 定义主键
     protected $pk = 'id';
 
+    // MySQL DATETIME has no fractional part; retain real non-zero precision.
+    public function getStartTimeAttr($value): string
+    {
+        return preg_replace('/^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\.0+$/D', '$1', (string)$value);
+    }
+
+    public function getEndTimeAttr($value): string
+    {
+        return preg_replace('/^(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2})\.0+$/D', '$1', (string)$value);
+    }
+
     /**
      * 活动详情
      * @param int $siginId 活动ID