CREATE TABLE table_58623 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Opponent" TEXT, "Score" TEXT)

What is Date, when Outcome is 'Runner Up', and when Opponent is 'Lu Jiaxiang'?
SELECT "Date" FROM table_58623 WHERE "Outcome" = 'runner up' AND "Opponent" = 'lu jiaxiang'
SELECT "Date" FROM "table_58623" WHERE "Opponent" = 'lu jiaxiang' AND "Outcome" = 'runner up'