When smaccess.log is rotated at '00:00', 7 new rotated files are created as below.
04/22/2017 12:00 AM 0 smaccess.log
04/21/2017 11:59 PM 0 smaccess_20170421_235915.log
04/21/2017 11:59 PM 0 smaccess_20170421_235925.log
04/21/2017 11:59 PM 0 smaccess_20170421_235935.log
04/21/2017 11:59 PM 0 smaccess_20170421_235945.log
04/21/2017 11:59 PM 0 smaccess_20170421_235955.log
04/21/2017 11:59 PM 0 smaccess_20170422_000005.log
This issue is product bug.
If rotated time is set '00:00', Policy Server can not judge the time properly.
This bug will be fixed in 12.7 Lyra.
Workarround is that you should set except '00:00' as Rollover time. (e.g 23:59)