CREATE TABLE table_67969 ("Event" TEXT, "Time" TEXT, "Nationality" TEXT, "Date" TEXT, "Meet" TEXT, "Location" TEXT)

On what Date was the Meet of 2007 Pan American Games with a Time of 1:07.78?
SELECT "Date" FROM table_67969 WHERE "Meet" = '2007 pan american games' AND "Time" = '1:07.78'
SELECT "Date" FROM "table_67969" WHERE "Meet" = '2007 pan american games' AND "Time" = '1:07.78'