CREATE TABLE table_55263 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score" TEXT)

On what date was the opponent in the final Gwinyai Tongoona?
SELECT "Date" FROM table_55263 WHERE "Opponent in the final" = 'gwinyai tongoona'
SELECT "Date" FROM "table_55263" WHERE "Opponent in the final" = 'gwinyai tongoona'