YTD-1 error

I'm having a measure to calculate YTD as well as YTD-1 values for which there are 2 formula's.

Of this, YTD-1 formula does not seem to be working.

=FormatDate(ToDate(UserResponse([YTD -1] ; "Date DD/MM/YYYY ?"); "yyyy-1");"dd-MM-yyyy")

Thanks for your inputs

~S