user: Question: On what date was the format of ed remaster CD?
Columns: ['Region', 'Date', 'Label', 'Format', 'Catalog']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['United Kingdom', 'May1971', 'Chrysalis Records', 'stereo LP', 'ILPS 9153']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Format" = 'ed remaster CD';