user: Question: What is the date of the tournament with 5 strokes as the margin of victory?
Columns: ['Date', 'Tournament', 'Winning score', 'To par', 'Margin of victory']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['17 May 1998', "McDonald's LPGA Championship", '65-68-72-68=273', '–11', '3 strokes']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Margin of victory" = '5 strokes';