Guys i need help with a similar function in Excel.

I need to substract the time difference to identify the time taken to complete a task, however the following needs to be included

- List of Holidays
- During Business Hours Only

Hence if
A1 = Activity Start Date
B2 = Activity End Date
X1 = Business Hours Start Time
X2 = Business Hours End Time
R1:13 = List of Holidays

How would i get this done ?

I dont want to use the work days formula as it excludes Weekends.

Please help !