优化代码

ruoyi-generator/src/main/java/com/ruoyi/generator/controller/CommunityArticleController.java

@@ -1557,7 +1557,7 @@ public class CommunityArticleController extends BaseController {
             } else {
                 communityArticleService.update(new UpdateWrapper<CommunityArticle>()
                         .set("is_top", false)
-                        .set("top_time", DateUtils.parseDate(DateUtils.getTime()))
+                        .set("top_time",null)
                         .eq("id", communityArticle.getId()));
                 msg = "已取消置顶";
             }