user: Question: What is the date of the match with a 28-15 record?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 2', 'Mets', '6 - 4', 'Gentry (2-1)', 14702.0, '17-7']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Record" = '28-15';