TheAirline.GUIModel.PagesModel.AirlinersPageModel.AirlinerOrdersMVVM.getDeliveryDate C# (CSharp) Method

        private DateTime getDeliveryDate()
        {
            double monthsToComplete = 0;

            foreach (AirlinerOrderMVVM order in this.Orders)
            {
                double orderToComplete = Math.Ceiling(Convert.ToDouble(order.Amount) / order.Type.ProductionRate);

                if (orderToComplete > monthsToComplete)
                {
                    monthsToComplete = orderToComplete;
                }
            }

            var latestDate = new DateTime(1900, 1, 1);

            foreach (AirlinerOrderMVVM order in this.Orders)
            {
                var date = new DateTime(
                    GameObject.GetInstance().GameTime.Year,
                    GameObject.GetInstance().GameTime.Month,
                    GameObject.GetInstance().GameTime.Day);
                int rate = order.Type.ProductionRate;
                if (order.Amount <= (rate / 4))
                {
                    date = date.AddMonths(3);
                }
                else
                {
                    for (int i = (rate / 4) + 1; i <= order.Amount; i++)
                    {
                        double iRate = 365 / rate;
                        date = date.AddDays(Math.Round(iRate, 0, MidpointRounding.AwayFromZero));
                    }
                }

                if (date > latestDate)
                {
                    latestDate = date;
                }
            }

            return latestDate;
        }