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

### Instruction:
What date has a Position of back, later than 1964, and a Test debut of 1st rl test v new zealand?

### Inputs:
table_name: table, columns: ['Player', 'Test debut', 'Year', 'Cross-code debut', 'Date', 'Position']

### Response:
SELECT Date FROM table WHERE Position = back AND Year > 1964 AND Test debut = 1st rl test v new zealand