Shopify Work need adjust calendar to work correctly -- 2

I have a Shopify store, when customer pre-order food for up to 7 days, before delivery, I get only order, not a DAY - FOR WHICH CUSTOMER PREORDERED. This is new Shopify store, so it is always something to fix. Looking for Provider who had Lot Of Shopify Work With Good Reviews. www.malibumealdelivery.com