Script to exclude Weekends and Public Holidays in SSRS

=IIF(DateValue(Fields!createdon.Value)=DateValue(Fields!modifiedon.Value),"0",
(DateDiff(DateInterval.day, DateValue(Fields!createdon.Value), DateValue(Fields!modifiedon.Value)))
- (DateDiff(DateInterval.WeekOfYear, DateValue(Fields!createdon.Value), DateValue(Fields!modifiedon.Value))*2)
- IIF(Weekday(DateValue(Fields!createdon.Value),1) = 1,1,0)
- IIF(Weekday(DateValue(Fields!createdon.Value),1) = 7,1,0)
- IIF(Weekday(DateValue(Fields!modifiedon.Value),1) = 1,1,0)
- IIF(Weekday(DateValue(Fields!modifiedon.Value),1) = 7,1,0)
-IIF(DateValue(Fields!createdon.Value)<=DateValue("January 01, 2017") and DateValue("January 01, 2017") <=DateValue(Fields!modifiedon.Value),1,0)
)