diff --git a/Gtk4/gtk153_time_reminder/.vscode/settings.json b/Gtk4/gtk153_time_reminder/.vscode/settings.json
index b7960d1..3ef0924 100644
--- a/Gtk4/gtk153_time_reminder/.vscode/settings.json
+++ b/Gtk4/gtk153_time_reminder/.vscode/settings.json
@@ -1,6 +1,8 @@
 {
     "C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools",
     "files.associations": {
-        "*.xpm": "cpp"
-    }
+        "*.xpm": "cpp",
+        "chrono": "cpp"
+    },
+    "cmake.configureOnOpen": true
 }
\ No newline at end of file
diff --git a/Gtk4/gtk153_time_reminder/CMakeLists.txt b/Gtk4/gtk153_time_reminder/CMakeLists.txt
index 8900131..46b227e 100644
--- a/Gtk4/gtk153_time_reminder/CMakeLists.txt
+++ b/Gtk4/gtk153_time_reminder/CMakeLists.txt
@@ -26,7 +26,7 @@ link_directories (${GTK4_LIBRARY_DIRS})
 # set(PO_DIR ${CMAKE_BINARY_DIR}/po/zh_CN/LC_MESSAGES)
 
 #Source files
-set(SOURCE_FILE src/main.cpp src/MyReminder.cpp)
+set(SOURCE_FILE src/main.cpp src/MyReminder.cpp src/timer.cpp)
 
 #Compile Resource
 
diff --git a/Gtk4/gtk153_time_reminder/src/MyReminder.cpp b/Gtk4/gtk153_time_reminder/src/MyReminder.cpp
index ca6096b..5cf40ff 100644
--- a/Gtk4/gtk153_time_reminder/src/MyReminder.cpp
+++ b/Gtk4/gtk153_time_reminder/src/MyReminder.cpp
@@ -1,16 +1,41 @@
 #include "MyReminder.h"
+#include "timer.h"
 
 struct _MyReminder
 {
     GtkApplicationWindow parent_instance;
-    GtkLabel *label1;
+    GtkWidget *time_label;
 };
 
 G_DEFINE_TYPE(MyReminder, my_reminder, GTK_TYPE_APPLICATION_WINDOW)
 
 static void my_reminder_init(MyReminder *self)
 {
+    // Set properties of window
+    gtk_window_set_icon_name(GTK_WINDOW(self), "org.gtk.daleclack");
+    gtk_window_set_default_size(GTK_WINDOW(self), 240, 200);
+    gtk_window_set_title(GTK_WINDOW(self), "Reminder");
+
+    // Create and add a label
+    self->time_label = gtk_label_new(" ");
+
+    // Get time duration
+    char time_str[57];
+    int time = get_time_duration(2023, 12, 23);
+    if(time >= 0){
+        snprintf(time_str, sizeof(time_str), "<span foreground=\"blue\" size='16pt'>%d</span>\nDays Left", time);
+    }else{
+        strncpy(time_str, "<span foreground=\"blue\" size='16pt'>Time is out!</span>", 13);
+    }
     
+    // Text style of the label
+    gtk_label_set_markup(GTK_LABEL(self->time_label), time_str);
+    gtk_label_set_use_markup(GTK_LABEL(self->time_label), TRUE);
+
+    // // Set label
+    // gtk_label_set_label(GTK_LABEL(self->time_label), time_str);
+
+    gtk_window_set_child(GTK_WINDOW(self), self->time_label);
 }
 
 static void my_reminder_class_init(MyReminderClass *klass)
diff --git a/Gtk4/gtk153_time_reminder/src/MyReminder.h b/Gtk4/gtk153_time_reminder/src/MyReminder.h
index 627051f..a686ab0 100644
--- a/Gtk4/gtk153_time_reminder/src/MyReminder.h
+++ b/Gtk4/gtk153_time_reminder/src/MyReminder.h
@@ -1,7 +1,9 @@
 #pragma once
 
 #include <gtk/gtk.h>
+#include "../json_nlohmann/json.hpp"
 
+using json = nlohmann::json;
 
 G_DECLARE_FINAL_TYPE(MyReminder, my_reminder, MY, REMINDER, GtkApplicationWindow)
 
diff --git a/Gtk4/gtk153_time_reminder/src/timer.cpp b/Gtk4/gtk153_time_reminder/src/timer.cpp
new file mode 100644
index 0000000..f4c778f
--- /dev/null
+++ b/Gtk4/gtk153_time_reminder/src/timer.cpp
@@ -0,0 +1,89 @@
+#include <cstdio>
+#include <ctime>
+#include <cstring>
+#include <cstdlib>
+#include "timer.h"
+
+// typedef void(*LP)(struct tm *local);//define a  pointer function
+#define MAX_PATH 260
+
+int total_day(int year, int month, int day)
+{
+    // Calculate day of 1 year
+    int sum = 0;
+    switch (month)
+    {
+    case 1:
+        sum = day;
+        break;
+    case 2:
+        sum = day + 31;
+        break;
+    case 3:
+        sum = day + 59;
+        break;
+    case 4:
+        sum = day + 90;
+        break;
+    case 5:
+        sum = day + 120;
+        break;
+    case 6:
+        sum = day + 151;
+        break;
+    case 7:
+        sum = day + 181;
+        break;
+    case 8:
+        sum = day + 212;
+        break;
+    case 9:
+        sum = day + 243;
+        break;
+    case 10:
+        sum = day + 273;
+        break;
+    case 11:
+        sum = day + 304;
+        break;
+    case 12:
+        sum = day + 334;
+        break;
+    default:
+        printf("Date Wrong!");
+    }
+    if (year % 4 == 0 && year % 100 != 0)
+        sum = sum + 1;
+    return sum;
+}
+
+int total_year_day(int year1, int year2)
+{
+    // Calculate day of years
+    int sum = 0;
+    sum = (year2 - year1) * 365;
+    for (int i = year1; i < year2; i++)
+    {
+        if (i % 4 == 0 && i % 100 != 0)
+        {
+            sum = sum + 1;
+        }
+    }
+    return sum;
+}
+
+int get_time_duration(int year, int month, int day)
+{
+    // Get Current time
+    time_t t;
+    t = time(NULL);
+    struct tm *local;
+    local = localtime(&t);
+
+    // Calculate duration
+    int duration_day = total_year_day(year, local->tm_year + 1900) 
+        + total_day(year, month, day) 
+        - total_day(local->tm_year + 1900, local->tm_mon + 1, local->tm_mday);
+
+    return duration_day;
+}
diff --git a/Gtk4/gtk153_time_reminder/src/timer.h b/Gtk4/gtk153_time_reminder/src/timer.h
new file mode 100644
index 0000000..c6ca657
--- /dev/null
+++ b/Gtk4/gtk153_time_reminder/src/timer.h
@@ -0,0 +1,16 @@
+#pragma once
+// These code from xe release
+
+int total_day(int year,int month,int day);
+
+int total_year_day(int year1,int year2);
+
+int get_time_duration(int year, int month, int day);
+
+// static inline bool rel_unix_file_system_detected(){
+// #ifdef _WIN32
+//     return false;
+// #else
+//     return true;
+// #endif
+// }