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

### Instruction:
When was the opponent Poland and the match type EC -qualifier?

### Inputs:
table_name: table, columns: ['Date', 'Location', 'Opponenent', 'Result', 'Match type']

### Response:
SELECT Date FROM table WHERE Opponenent = poland AND Match type = ec -qualifier