HJGL_DS/BLL/HJGL/PersonManage/HJGL_PersonManageService.cs

@@ -102,7 +102,7 @@ namespace BLL
                          select x;
                 foreach(var w in pw)
                 {
-                    w.ExchangeTime = DateTime.Now;
+                    w.ExchangeTime = null;
                 }
                 db.SubmitChanges();