CREATE TABLE table_45790 ("Date" TEXT, "Tournament" TEXT, "Winning score" TEXT, "Margin of victory" TEXT, "Runner ( s ) -up" TEXT)

On what date is Jerilyn Britz the runner-up?
SELECT "Date" FROM table_45790 WHERE "Runner(s)-up" = 'jerilyn britz'
SELECT "Date" FROM "table_45790" WHERE "Runner(s)-up" = 'jerilyn britz'