CREATE TABLE table_name_26 (date_of_appointment VARCHAR(255), manner_of_departure VARCHAR(255), outgoing_manager VARCHAR(255))
What is the date of appointment of outgoing manager fred rutten, who had a sacked manner of departure?
    
SQL: SELECT date_of_appointment FROM table_name_26 WHERE manner_of_departure = "sacked" AND outgoing_manager = "fred rutten"