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_261927_2 (joined VARCHAR, left VARCHAR, nickname VARCHAR)

### Question ###
What date did the institution that left in 2013 and that is nicknamed Corsairs, join? 

### Accurate SQL ###

SELECT joined FROM table_261927_2 WHERE left = "2013" AND nickname = "Corsairs"