Calculate fiscal year in SQL Server

Question

How would you calculate the fiscal year from a date field in a view in SQL Server?

Answer 1

    declare 
@InputDate datetime,
@FiscalInput varchar(2),
@FiscalYear varchar(4),
@FiscalMonth varchar(2),
@FiscalStart varchar(10),
@FiscalDate varchar(10)

set @FiscalInput = '10'
set @InputDate = '1/5/2010'
set @FiscalYear = (select 
                    case 
                    when datepart(mm,@InputDate) < cast(@FiscalInput as int)
                        then datepart(yyyy, @InputDate)
                    when datepart(mm,@InputDate) >= cast(@FiscalInput as int)
                        then datepart(yyyy, @InputDate) + 1
                        end FiscalYear)


set @FiscalStart = (select @FiscalInput + '/01/' + @FiscalYear)

set @FiscalDate = (select cast(datepart(mm,@InputDate) as varchar(2)) + '/' + cast(datepart(dd,@InputDate) as varchar(2)) + '/' + @FiscalYear)
set @FiscalMonth = (select 
                    case 
                    when datepart(mm,@InputDate) < cast(@FiscalInput as int)
                        then 13 + datediff(mm, cast(@FiscalStart as datetime),@InputDate)
                    when datepart(mm,@InputDate) >= cast(@FiscalInput as int)
                        then 1 + datediff(mm, cast(@FiscalStart as datetime), @FiscalDate)
                        end FiscalMonth)    

select @InputDate as Date, 
cast(@FiscalStart as datetime) as FiscalStart, 
dateadd(mm, 11,cast(@FiscalStart as datetime)) as FiscalStop,
cast(@FiscalDate as DateTime) as FiscalDate,
@FiscalMonth as FiscalMonth, 
@FiscalYear as FiscalYear