Here is a SQL way to do this easily:
declare @Date date = '20140201';
select cast(YEAR(dateadd(month,9,@Date))-1 as varchar(4)) + '-' + cast(YEAR(dateadd(month,9,@Date)) as varchar(4))
set @Date = '20140612';
select cast(YEAR(dateadd(month,9,@Date))-1 as varchar(4)) + '-' + cast(YEAR(dateadd(month,9,@Date)) as varchar(4))