user: Question: What date was Movistar accredited?
Columns: ['Company name', 'Network brand name', 'Country', 'Accreditation type', 'Accreditation level', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Vodafone Group', 'Vodafone-Spain', 'Spain', 'Provisional', 'joyn Hot Fixes', 'Approved (valid until 03.04.13)']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Network brand name" = 'Movistar';