+ new_selected_day_date = postvars['selected_day_date'][0]
+ if new_selected_day_date != db.selected_day_date:
+ if new_selected_day_date in db.days.keys():
+ raise PlomException('cannot use same date twice')
+ else:
+ db.days[new_selected_day_date] = db.selected_day
+ del db.days[db.selected_day_date]
+ db.selected_day_date = new_selected_day_date
+