On what Date was the Meet of 2007 Pan American Games with a Time of 1:07.78?
CREATE TABLE "women" (
  "event" text,
  "time" text,
  "nationality" text,
  "date" text,
  "meet" text,
  "location" text
);
SELECT "date" FROM "women" WHERE "meet"='2007 pan american games' AND "time"='1:07.78';