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_23015396_1 ( year VARCHAR, date VARCHAR )

### Question ###
Name the number of year for june 30

### Accurate SQL ###

SELECT COUNT(year) FROM table_23015396_1 WHERE date = "June 30"