CREATE TABLE table_34990 ("Date" TEXT, "Visitor" TEXT, "Score" TEXT, "Home" TEXT, "Leading scorer" TEXT, "Record" TEXT)

What's the date of the game that has the Bulls as a visiting team?
SELECT "Date" FROM table_34990 WHERE "Visitor" = 'bulls'
SELECT "Date" FROM "table_34990" WHERE "Visitor" = 'bulls'