what is the status date of the product name Book collection C ?
SELECT status_date FROM view_product_availability AS T1 JOIN products_for_hire AS T2 ON T1.product_id   =   T2.product_id WHERE product_name  = "Book collection C"
status date of the product name refers to status_date; product name Book collection C refers to WHERE product_name = 'Book collection C'; joining tables view_product_availability and products_for_hire to match product_id.