user: Question: What day did they play Cambridge United?
Columns: ['Match', 'Date', 'Competition or tour', 'Ground', 'Opponent', 'Score1']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '11 July 2007', '—', 'A', 'Weston-super-Mare A.F.C.', '1 - 0']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Opponent" = 'Cambridge United';