SLA Calculation Help needed in Excluding Weekends and Off business hours for calculation

Hi all,

I have to develop a SLA Report. I have already developed using the query in below link

http://social.msdn.microsoft.com/Forums/en-US/transactsql/thread/daadf1b5-631f-4135-a22b-9012f9a0887d

Everything is fine, except its taking a little time. Now i am facing a difficulty here.

I should be able to skip weekends. Weekends should not be included in Calculation and if any item comes in after 3AM ist, the calculation shoould start from 8AM IST. Any help on how can i achieve this.

Thanks & Regards,
Manjunath C Bhat,
http://manjunathcbhat.blogspot.com
http://manjunathcbhat.wordpress.com