diff --git a/Database/Session.cpp b/Database/Session.cpp
index c4dee9a..29bd175 100644
--- a/Database/Session.cpp
+++ b/Database/Session.cpp
@@ -1,11 +1,13 @@
 #include "Session.h"
 #include <Wt/Auth/Dbo/UserDatabase.h>
+#include <Wt/Dbo/WtJsonSqlTraits.h>
 
 Session::Session(Wt::Dbo::SqlConnectionPool &connectionPool) {
     setConnectionPool(connectionPool);
 
     mapClass<Task>("task");
     mapClass<HomeBox::Item>("homebox_item");
+    mapClass<VisitorRecord>("visitor_record");
 
     mapClass<User>("user");
     mapClass<AuthInfo>("auth_info");
@@ -34,6 +36,18 @@ Wt::Auth::Login &Session::login() {
     return m_login;
 }
 
+namespace Wt {
+namespace Dbo {
+template <>
+void JsonSerializer::act(FieldRef<std::chrono::system_clock::time_point> field) {
+    using namespace std::chrono;
+    writeFieldName(field.name());
+    fastJsStringLiteral(std::to_string(duration_cast<seconds>(field.value().time_since_epoch()).count()));
+}
+} // namespace Dbo
+} // namespace Wt
+
 DBO_INSTANTIATE_TEMPLATES(User)
 DBO_INSTANTIATE_TEMPLATES(Task)
-DBO_INSTANTIATE_TEMPLATES(HomeBox::Item)
\ No newline at end of file
+DBO_INSTANTIATE_TEMPLATES(HomeBox::Item)
+DBO_INSTANTIATE_TEMPLATES(VisitorRecord)
diff --git a/Database/Session.h b/Database/Session.h
index d76204b..343c534 100644
--- a/Database/Session.h
+++ b/Database/Session.h
@@ -6,6 +6,7 @@
 #include "User.h"
 #include <Wt/Auth/Login.h>
 #include <Wt/Dbo/Session.h>
+#include "VisitorRecord.h"
 
 using UserDatabase = Wt::Auth::Dbo::UserDatabase<AuthInfo>;
 
diff --git a/Database/Task.h b/Database/Task.h
index b744376..d6dafaa 100644
--- a/Database/Task.h
+++ b/Database/Task.h
@@ -2,6 +2,7 @@
 #define __TASK_H__
 
 #include <Wt/Dbo/Dbo.h>
+#include <Wt/Dbo/StdSqlTraits.h>
 #include <string>
 
 class Task;
@@ -10,7 +11,7 @@ using Tasks = Wt::Dbo::collection<Wt::Dbo::ptr<Task>>;
 class Task {
 public:
     bool finished = false;
-    int32_t createTime = 0;
+    std::chrono::system_clock::time_point createTime;
     std::string content;
     std::string comment;
 
@@ -29,5 +30,4 @@ public:
     }
 };
 
-
 #endif // __TASK_H__
\ No newline at end of file
diff --git a/Database/VisitorRecord.h b/Database/VisitorRecord.h
new file mode 100644
index 0000000..9ae31eb
--- /dev/null
+++ b/Database/VisitorRecord.h
@@ -0,0 +1,22 @@
+#ifndef __VISITORRECORD_H__
+#define __VISITORRECORD_H__
+
+#include <Wt/Dbo/Dbo.h>
+
+class VisitorRecord {
+public:
+    std::string url;
+    std::string userAgent;
+    std::string visitorUuid;
+    std::chrono::system_clock::time_point time;
+
+    template <class Action>
+    void persist(Action &a) {
+        Wt::Dbo::field(a, url, "url");
+        Wt::Dbo::field(a, userAgent, "user_agent");
+        Wt::Dbo::field(a, visitorUuid, "visitor_uuid");
+        Wt::Dbo::field(a, time, "time");
+    }
+};
+
+#endif // __VISITORRECORD_H__
\ No newline at end of file
diff --git a/Server/Application.cpp b/Server/Application.cpp
index c5a0cbc..51e839e 100644
--- a/Server/Application.cpp
+++ b/Server/Application.cpp
@@ -78,6 +78,7 @@ Application::Application(const std::string &path)
 
     m_router->insert("/api/v1/task/add", [this](HttpSession &session, const Request &request, const boost::urls::matches &matches) mutable {
         using namespace boost::beast;
+        using namespace std::chrono;
         LOG(info) << "add task: " << request.body();
         auto rootJson = boost::json::parse(request.body());
         auto &root = rootJson.as_object();
@@ -88,7 +89,7 @@ Application::Application(const std::string &path)
         }
         auto database = Amass::Singleton<Database>::instance()->session();
         auto task = std::make_unique<Task>();
-        task->createTime = root.at("createTime").as_int64();
+        task->createTime = system_clock::time_point(seconds(root.at("createTime").as_int64()));
         task->content = content;
         task->comment = std::string(root.at("comment").as_string());
         auto t = database->add(std::move(task));