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

### Instruction:
What date has a competition of 2012 afc challenge cup, and dasarath rangasala stadium, kathmandu as the venue?

### Inputs:
table_name: table, columns: ['Date', 'Venue', 'Score', 'Result', 'Competition']

### Response:
SELECT Date FROM table WHERE Competition = 2012 afc challenge cup AND Venue = dasarath rangasala stadium, kathmandu