user: Question: When was the scorer McCoist (3), Johnston, Butcher, Steven?
Columns: ['Date', 'Opponent', 'Venue', 'Result', 'Attendance', 'Scorers']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['21 August 1990', 'East Stirlingshire', 'H', '5–0', 25595.0, 'Hateley (2), Steven, Walters, Johnston']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Scorers" = 'McCoist (3), Johnston, Butcher, Steven';