Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What date was the men's 100m breaststroke in heat 6?

### Inputs:
table_name: table, columns: ['Date', 'Event', 'Heat/Semifinal/Final', 'Nation', 'Time']

### Response:
SELECT Date FROM table WHERE Event = men's 100m breaststroke AND Heat/Semifinal/Final = heat 6