Write SQL query to solve given problem: Among all the flights scheduled to depart from John F. Kennedy International on 2018/8/1, when was the earliest one scheduled to depart?. Keep the solution inside sql tag ```sql [SQL-Query] ```
SELECT T2.DEP_TIME FROM Airports AS T1 INNER JOIN Airlines AS T2 ON T1.Code = T2.ORIGIN WHERE T2.FL_DATE = '2018/8/1' AND T1.Description = 'New York, NY: John F. Kennedy International' AND T2.DEP_TIME IS NOT NULL ORDER BY T2.DEP_TIME ASC LIMIT 1