System clock: 2017/06/01 20:33
Read mtime for dst-file = 2017/07/01 12:00:00
Read mtime for non-dst-file = 2017/02/01 12:00:00
System clock: 2017/02/01 20:33
Read mtime for dst-file = 2017/07/01 12:00:00
Read mtime for non-dst-file = 2017/02/01 12:00:00