Using A Year Parameter In A Date Condition

I am collecting a year parameter from my user and want to use that year as part of a complete date condition.

So I collect the year say '2003' from my user.

A condition must be applied so that the date must be after 01-APR-...and here is where i want to utilize the parameter @Year. So I can apply the same date condition depending on what year we are looking at.

I am currently using the following logic:

(DATEPART(yy, CANCELLATION_DATE) = @Year)
AND
(DATEPART(mm, CANCELLATION_DATE) >= 04)
AND
(DATEPART(dd, CANCELLATION_DATE) >= 02)

This causes problems as the date can be only Jan, Feb, Mar, Apr 01 or 02. What I need is to gather all dates prior to Apr 02, with the year paramter to follow.

We originally developed this querty using Oracle so idealy there would exist a pl-sql to t-sql conversion tool out there! Anybody know of one?

Here is how the pl-sql is structured:
CANCELLATION_DATE >= TO_DATE('02-APR-'||:"Year",'DD-MON-YYYY') ) ) )

Thanks in advance,
mpaskevi