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_27973624_1 ( main_date VARCHAR, round VARCHAR )

### Question ###
What is the main date when the round is third round qualifying?

### Accurate SQL ###

SELECT main_date FROM table_27973624_1 WHERE round = "Third round Qualifying"