How to convert switch statement into iif than else statement in SSRS

Hi All;

How do i convert switch statement into iif statement in ssrs

=

Switch(
Fields!createdonValue.Value = Now(), "Today",
Fields!createdonValue.Value = DateAdd("d",-1,Today()),"Yesterday",
Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -6,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and 
Fields!createdonValue.Value <=  FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Week",


Fields!createdonValue.Value >= FORMATDATETIME(DateAdd(DateInterval.Day, -13,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate) and 
Fields!createdonValue.Value <=  FORMATDATETIME(DateAdd(DateInterval.Day, -0,DateAdd(DateInterval.Day, 1-Weekday(today),Today)),DATEFORMAT.ShortDate),"Last Fortnight",

Fields!createdonValue.Value >= DateValue(DateAdd("M",-1,DateAdd("D",-(Day(Now)-1),Now))) and 
Fields!createdonValue.Value <= DateValue(DateAdd("D",-1,DateAdd("D",-(Day(Now)-1),Now))),"Last Month",


Fields!createdonValue.Value >= DateSerial(Year(Now()), 1, 1) and 
Fields!createdonValue.Value <= DateSerial(Year(Now()), 12, 31),"Year to Date"

)

Any help much appreciated

Thanks

Pradnya07