SELECT "Date of vacancy" FROM table_22614 WHERE "Position in table" = '23rd'
At what date did the 23rd manager vacate the position?
CREATE TABLE table_22614 (
    "Team" text,
    "Outgoing manager" text,
    "Manner of departure" text,
    "Date of vacancy" text,
    "Replaced by" text,
    "Date of appointment" text,
    "Position in table" text
)