CREATE TABLE table_68079 ("Week" FLOAT, "Date" TEXT, "Visiting Team" TEXT, "Final Score" TEXT, "Host Team" TEXT, "Stadium" TEXT)

What date had the Houston Texans as visitors?
SELECT "Date" FROM table_68079 WHERE "Visiting Team" = 'houston texans'
SELECT "Date" FROM "table_68079" WHERE "Visiting Team" = 'houston texans'