user: Question: On what date was the handicap 8 st 12 lb?
Columns: ['Age', 'Date', 'Track', 'Race', 'Distance (miles)', 'Jockey', 'Handicap', 'Field (No. horses)', 'Place', 'Time', 'Prize Money', '+ Sweepstake', 'Archer’s winnings']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [3.0, '29 May 1860', 'Randwick', 'Tattersall’s Free Handicap', '1 ½', 'John Cutts', '7 st 5 lb (46.82kg)', '14', 'Unplaced', 'u/k', '150s', '5s', 'Nil']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Handicap" = '8 st 12 lb';