var tiered_offers_all:Array<Int> = _offersLoader.getKeys();
        var tiers:Array<TieredOfferTierStruct>;
        var tier:TieredOfferTierStruct;
        var possibleOffers:Array<Int> = new Array<Int>();
        _activeOfferId = 0;
        var timeToStart:Float = -1;
        for (tiered_offer_id in tiered_offers_all) {
            if (ServerTime.getTimestamp() > _offersLoader.getEnd(tiered_offer_id)) continue;
            if (_lastRegion < _offersLoader.getRegionId(tiered_offer_id)) continue;
            if (_inventoryManager.getLevel() < _offersLoader.getReqLevel(tiered_offer_id)) continue;
            if (ServerTime.getTimestamp() < _offersLoader.getStart(tiered_offer_id)) {
                timeToStart = _offersLoader.getStart(tiered_offer_id) - ServerTime.getTimestamp();
                continue;
            }
            if (_tieredOfferStartTime == 0) {
                _tieredOfferStartTime = _offersLoader.getStart(tiered_offer_id);
            } else {
                _tieredOfferStartTime = Math.min(_tieredOfferStartTime, _offersLoader.getStart(tiered_offer_id));
            }
            _tieredOfferFinishTime = Math.max(_tieredOfferFinishTime, _offersLoader.getEnd(tiered_offer_id));
            tiers = _offersLoader.getTiers(tiered_offer_id);
            for (tier in tiers) {
                if (_viewedOffers.indexOf(tiered_offer_id) >= 0 || _boughtOffers.indexOf(tier.getId()) >= 0) {
                    _activeOfferId = tiered_offer_id;
                }
            }
            possibleOffers.push(tiered_offer_id);
        }
        if (_activeOfferId == 0) {
            for (tiered_offer_id in possibleOffers) {
                if (_offersLoader.getRegionId(tiered_offer_id) == _lastRegion) {
                    _activeOfferId = tiered_offer_id;
                    break;
                }
            }
        }
        if (_activeOfferId == 0) {
            DiggyError.info('TieredOffersManager.revalidateOffers no active offer found');
        }
        if (timeToStart > 0 && timeToStart < 4 * 3600) {
            // any offer will start in next 4 hours, refresh in 4 hours
            _timeoutID = Actuate.timer(timeToStart).onComplete(revalidateAfterTimeout);
        }