CREATE TABLE table_12427 ("Outcome" CLOB, "Date" CLOB, "Tournament" CLOB, "Surface" CLOB, "Partner" CLOB, "Opponents" CLOB, "Score" CLOB)

What Date has an Outcome of runner up, and a Partner of tyra calderwood?
SELECT "Date" FROM table_12427 WHERE "Outcome" = 'runner up' AND "Partner" = 'tyra calderwood'
SELECT "Date" FROM "table_12427" WHERE "Outcome" = 'runner up' AND "Partner" = 'tyra calderwood'