What is the date of the issue where the pictorials is of Female s disk jockey?
CREATE TABLE "table1_1566848_7" (
  "date" text,
  "cover_model" text,
  "centerfold_model" text,
  "interview_subject" text,
  "20_questions" text,
  "pictorials" text
);
SELECT COUNT("date") FROM "table1_1566848_7" WHERE "pictorials"='Female s disk jockey';