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

### Instruction:
Which date's opponent was Dender when the tournament was in the Jupiler League and the ground was a?

### Inputs:
table_name: table, columns: ['Date', 'Tournament', 'Round', 'Ground', 'Opponent', 'Score 1']

### Response:
SELECT Date FROM table WHERE Opponent = dender AND Tournament = jupiler league AND Ground = a