Quais são todas as datas para os vencedores do GTC Graeme Mundy, Jamie Smyth e os vencedores do GT3 Hector Lester, Tim Mullen?
CREATE TABLE table_13079788_3 (date VARCHAR, gtc_winner VARCHAR, gt3_winner VARCHAR)
SELECT date FROM table_13079788_3 WHERE gtc_winner = "Graeme Mundy Jamie Smyth" AND gt3_winner = "Hector Lester Tim Mullen"