Thanks a lot for your support and all time quick responses 
.
We tried this work around and were able to generate the reports. We changed the system time of usage meter to 11:45 PM 31st of July and restarted tomcat server. it worked to get auto-generated email with the reports attached.
According to this we concluded that we can generate only monthly reports, the option shown in the page for 1 day, 2 day and so on, doesn't work.
Thanks again,
Vivek Issar