The Scheduler uses exact time points. If you select a single day the dates will look like this:
* start = 2016-08-10T00:00:00
* end = 2016-08-11T00:00:00
If you store the dates as date only (instead of date/time) you can use EvenEndSpec = DateTimeSpec.Date in the config. This will convert the input and output end dates to date only and you will see the following:
* start = 2016-08-10T00:00:00
* end = 2016-08-10T00:00:00