public Date getToOpenDate () {
        Date toOpenDate = null;

        for (ReceptionsFilter filter: filters) {
            if (filter instanceof OpenDateReceptionsFilter) {
                OpenDateReceptionsFilter openDateFilter = (OpenDateReceptionsFilter) filter;
                Date filterToOpenDate =  openDateFilter.getToDate();
                if (toOpenDate == null || (toOpenDate != null && filterToOpenDate != null && toOpenDate.getTime() > filterToOpenDate.getTime()) )
                    toOpenDate = filterToOpenDate;
            }
        }

        return toOpenDate;
    }