CREATE TABLE table_58447 ("Date" CLOB, "Venue" CLOB, "Score" CLOB, "Result" CLOB, "Competition" CLOB)

What is the date of Competition of 2008 africa cup of nations?
SELECT "Date" FROM table_58447 WHERE "Competition" = '2008 africa cup of nations'
SELECT "Date" FROM "table_58447" WHERE "Competition" = '2008 africa cup of nations'