SELECT airing_date FROM table_name_50 WHERE official_website = "official website" AND number_of_episodes = 20 AND genre = "modern action" AND english_title__chinese_title_ = "armed reaction 陀槍師姐"
Berapa tanggal penayangan reaksi bersenjata 陀 槍 師姐 dengan 20 episode dalam genre aksi modern yang memiliki situs web resmi?
CREATE TABLE table_name_50 (airing_date VARCHAR, english_title__chinese_title_ VARCHAR, genre VARCHAR, official_website VARCHAR, number_of_episodes VARCHAR)