CREATE TABLE table_name_13 (date INT, u_boats_destroyed__kuk_ VARCHAR, tonnage VARCHAR)

What is listed as the average Date that has U-boats destroyed (KuK) of 2 with Tonnage of 1,514,050?
SELECT AVG(date) FROM table_name_13 WHERE u_boats_destroyed__kuk_ = "2" AND tonnage = "1,514,050"
SELECT AVG("date") FROM "table_name_13" WHERE "1,514,050" = "tonnage" AND "2" = "u_boats_destroyed__kuk_"