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_41912 ( "Date" text, "Cover model" text, "Centerfold model" text, "Interview subject" text, "20 Questions" text )

### Question ###
When was Shannon Long the Centerfold model?

### Accurate SQL ###

SELECT "Date" FROM table_41912 WHERE "Centerfold model" = 'shannon long'