Floating schedules from time zone context when used in a business rule

[Valqe]

Hi all,
I'm struggling to understand floating schedules from time-zone context when used in Business Rule and I was hoping your comments will help.

This is my scenario.
I have fulfillers in different time-zones.  I have 8-5 schedule I want to use. 
I want a business rule to trigger mobile notification to 'assigned_to' user [incident] when following condition is met:

1. Assined_to field is populated and hours are outside of 8-5 schedule.

Question: How to make my  BR 'aware' of assigned_to user time zone in context of 8-5 local schedule?

So far I have created following script prototype, but it does not account for assigned_to field value user time zone.

Thank you for your comments.

V.

[VaranAwesomenow]

user record has timezone field

[Valqe]

Thank you for your reply Anil.

Question: How would you script user record time-zone field value in a business rule IF condition (line 5 below)?
P.S. Business rule runs on [incident] table and "assigned_to" field is user field whose time-zone has to be checked in IF condition.

Thank you