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_66525 ( "New area code" real, "Where" text, "Affected area codes" text, "Format" text, "Effective date" text )

### Question ###
Which Effective date has a Where of illinois, and Affected area codes of 217?

### Accurate SQL ###

SELECT "Effective date" FROM table_66525 WHERE "Where" = 'illinois' AND "Affected area codes" = '217'