Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_11964047_9 (date VARCHAR, visitor VARCHAR, record VARCHAR)

### Question ###
 what's the date where visitor is phoenix suns and record is 31–30

### Accurate SQL ###

SELECT date FROM table_11964047_9 WHERE visitor = "Phoenix Suns" AND record = "31–30"