Refering Aliases In The Same View/ Query

HI,
I have a view where I want to add Rundate and Prev Month Rundate as computed columns to simplify my joins and calculations.
Rundate will be a select from another table that has a list of rundates for each month like this.
SELECT MAX(fm_dateend)
FROM dbo.tbl_FiscalMonth
WHERE fm_dateend <= getdate()) AS smalldatetime) AS CurrRunDate
Now, I want to add Prev Month Rundate on the basis of CurrRunDate but it does not accept CurrRunDate. The query is like this

SELECT MAX(fm_dateend)
FROM dbo.tbl_FiscalMonth
WHERE fm_dateend < CurrRunDate) AS smalldatetime) AS PrevMonthRunDate

Can anyone help me to work around with the alias as I dont like to put a whole bunch of code inplace of CurrRunDate(Alias).

Thanks,
Shariq