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_420 ( "Symbol" text, "Description" text, "Success" text, "Date of completion" text, "Deadline for completion" text )

### Question ###
what's the date of completion where deadline for completion is september 30, 2007

### Accurate SQL ###

SELECT "Date of completion" FROM table_420 WHERE "Deadline for completion" = 'September 30, 2007'