CREATE TABLE table_9222 ("Event" TEXT, "Time" TEXT, "Name" TEXT, "Nation" TEXT, "Games" TEXT, "Date" TEXT)

On what day was the record set at the 2002 Salt Lake City games with a time of 3:57.70?
SELECT "Date" FROM table_9222 WHERE "Games" = '2002 salt lake city' AND "Time" = '3:57.70'
SELECT "Date" FROM "table_9222" WHERE "Games" = '2002 salt lake city' AND "Time" = '3:57.70'