Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['New area code', 'Where', 'Affected area codes', 'Format', 'Effective date']

### Response:
SELECT Effective date FROM table WHERE Where = illinois AND Affected area codes = 217