static void
change_date (CcDateTimePanel *self)
{
  CcDateTimePanelPrivate *priv = self->priv;
  guint mon, y, d;
  GDateTime *old_date;

  old_date = priv->date;

  mon = 1 + gtk_combo_box_get_active (GTK_COMBO_BOX (W ("month-combobox")));
  y = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (W ("year-spinbutton")));
  d = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (W ("day-spinbutton")));

  priv->date = g_date_time_new_local (y, mon, d,
                                      g_date_time_get_hour (old_date),
                                      g_date_time_get_minute (old_date),
                                      g_date_time_get_second (old_date));
  g_date_time_unref (old_date);
  queue_set_datetime (self);
}
static void
change_time (GtkButton       *button,
             CcDateTimePanel *panel)
{
  CcDateTimePanelPrivate *priv = panel->priv;
  const gchar *widget_name;
  gint direction;
  GDateTime *old_date;

  old_date = priv->date;

  widget_name = gtk_buildable_get_name (GTK_BUILDABLE (button));

  if (strstr (widget_name, "up"))
    direction = 1;
  else
    direction = -1;

  if (widget_name[0] == 'h')
    {
      priv->date = g_date_time_add_hours (old_date, direction);
    }
  else if (widget_name[0] == 'm')
    {
      priv->date = g_date_time_add_minutes (old_date, direction);
    }
  else
    {
      int hour;
      hour = g_date_time_get_hour (old_date);
      if (hour >= 12)
        priv->date = g_date_time_add_hours (old_date, -12);
      else
        priv->date = g_date_time_add_hours (old_date, 12);
    }
  g_date_time_unref (old_date);

  update_time (panel);
  queue_set_datetime (panel);
}
static void
change_time (CcDateTimePanel *panel)
{
  CcDateTimePanelPrivate *priv = panel->priv;
  guint h, m;
  GDateTime *old_date;

  old_date = priv->date;

  h = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (W ("h_spinbutton")));
  m = gtk_spin_button_get_value_as_int (GTK_SPIN_BUTTON (W ("m_spinbutton")));

  if (priv->clock_format == G_DESKTOP_CLOCK_FORMAT_12H)
    {
      gboolean is_pm_time;
      GtkWidget *visible_child;

      visible_child = gtk_stack_get_visible_child (GTK_STACK (priv->am_pm_stack));
      if (visible_child == priv->pm_label)
        is_pm_time = TRUE;
      else
        is_pm_time = FALSE;

      if (h == 12)
        h = 0;
      if (is_pm_time)
        h += 12;
    }

  priv->date = g_date_time_new_local (g_date_time_get_year (old_date),
                                      g_date_time_get_month (old_date),
                                      g_date_time_get_day_of_month (old_date),
                                      h, m,
                                      g_date_time_get_second (old_date));
  g_date_time_unref (old_date);

  update_time (panel);
  queue_set_datetime (panel);
}