116     LV_ASSERT_FORMAT_MSG(newd.year >= 0 && newd.month >= 1 && newd.month <= 12,  in month_event_cb()
117                          "Invalid date: %d-%d", newd.year, newd.month);  in month_event_cb()
121         if(newd.month == 1) {  in month_event_cb()
122             newd.month = 12;  in month_event_cb()
126             newd.month --;  in month_event_cb()
130         if(newd.month == 12) {  in month_event_cb()
131             newd.month = 1;  in month_event_cb()
135             newd.month ++;  in month_event_cb()
139     lv_calendar_set_month_shown(calendar, newd.year, newd.month);  in month_event_cb()
142     lv_label_set_text_fmt(label, "%d %s", newd.year, month_names_def[newd.month - 1]);  in month_event_cb()
151     LV_ASSERT_FORMAT_MSG(date->year >= 0 && date->month >= 1 && date->month <= 12,  in value_changed_event_cb()
152                          "Invalid date: %d-%d", date->year, date->month);  in value_changed_event_cb()
155     lv_label_set_text_fmt(label, "%d %s", date->year, month_names_def[date->month - 1]);  in value_changed_event_cb()