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

### Instruction:
What date was Movistar accredited?

### Inputs:
table_name: table, columns: ['Company name', 'Network brand name', 'Country', 'Accreditation type', 'Accreditation level', 'Date']

### Response:
SELECT Date FROM table WHERE Network brand name = movistar