CREATE TABLE table_name_2 (date_of_polling VARCHAR(255), liberal VARCHAR(255), polling_firm VARCHAR(255), green VARCHAR(255))
On what date of polling was the Polling Firm forum research with 7 green and less than 30 liberals?
    
SQL: SELECT date_of_polling FROM table_name_2 WHERE polling_firm = "forum research" AND green = 7 AND liberal < 30