user: Question: Result of W, and a Competition of 1968 Asian Cup happened on What date?
Columns: ['Date', 'Result', 'Score', 'Venue', 'Competition']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['01-Jun-62', 'D', '1–1', 'Tehran , Iran', 'Friendly']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Result" = 'W' AND "Competition" = '1968 Asian Cup';