CREATE TABLE table_name_33 (date VARCHAR, competition VARCHAR, runners_up VARCHAR)

What date did the Fai Cup with Derry City F.C. as runners-up take place?
SELECT date FROM table_name_33 WHERE competition = "fai cup" AND runners_up = "derry city f.c."
SELECT "date" FROM "table_name_33" WHERE "competition" = "fai cup" AND "derry city f.c." = "runners_up"