CREATE TABLE table_78367 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Save" TEXT, "Attendance" TEXT, "Record" TEXT)

What was the date of the Mariners game when they had a record of 53 17?
SELECT "Date" FROM table_78367 WHERE "Record" = '53–17'
SELECT "Date" FROM "table_78367" WHERE "Record" = '53–17'