The problem with unloading report

The problem with unloading report

When selecting the reporting period , from 26/02/2015 to 26/02/2015 and click Get

A blank window opens the report with a zero number of sessions .
If you select a period from 25/02/2015 to 26/02/2015 it turns out the report with a zero number of sessions per 25/02/2015 and three sessions for 26/02/2015