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_78079 ( "Airing date" text, "Number of episodes" real, "HD format" text, "Highest average point ratings" real, "Genre" text, "Official website" text )

### Question ###
What was the airing date when the number of episodes was larger than 20 and had the genre of costume action?

### Accurate SQL ###

SELECT "Airing date" FROM table_78079 WHERE "Number of episodes" > '20' AND "Genre" = 'costume action'