#include <gtk/gtk.h>

  GtkWidget *window;
  GtkWidget *vbox;
  GtkWidget *button;
  GtkWidget *label;
  

void button_clicked(GtkWidget *widget, gpointer data) {
  GDateTime *now = g_date_time_new_now_local();
  gchar *my_time = g_date_time_format(now,"%s");
  gtk_label_set_text((GtkLabel *) label, (char *) my_time);
}

int main(int argc, char *argv[]) {

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
  gtk_window_set_default_size(GTK_WINDOW(window), 200, 320);
  gtk_window_set_title(GTK_WINDOW(window), "LABEL TIME");

  gtk_container_set_border_width(GTK_CONTAINER(window), 5);

  vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL,1);
  label = gtk_label_new(NULL);
  button = gtk_button_new_with_label("TIME");
  gtk_container_add(GTK_CONTAINER(window),vbox);
  gtk_box_pack_start(GTK_BOX(vbox), label,TRUE,TRUE,0);
  gtk_box_pack_start(GTK_BOX(vbox), button,TRUE,TRUE,0);

  g_signal_connect(G_OBJECT(button), "clicked",
		   G_CALLBACK(button_clicked), NULL);

  g_signal_connect(G_OBJECT(window), "destroy",
        G_CALLBACK(gtk_main_quit), NULL);

  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}