Trying to build an automated schedule

I have been trying to create a macro that would create a schedule for me based on date and a product type. In columns K-N I have an IF statement that tells when a shipment would need to arrive in a row that corresponds with a date (column A is 1/1/2015 - 12/31/2015). On the next page I would like to generate a schedule that lists the dates that all of the products are needed in chronological order. I've tried to use custom functions like finding the nth_occurence but it just gets way too messy with so many shipments. Any help would be great, thanks!