Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_1566850_8 ( date VARCHAR, centerfold_model VARCHAR )

### Question ###
When was Kalin Olson listed as the centerfold model?

### Accurate SQL ###

SELECT date FROM table_1566850_8 WHERE centerfold_model = "Kalin Olson"