Rename the existing table with date suffix

Hi,
I'm trying to rename a table with date suffix at the end of the table name, and drop the date suffix table which is greater than 7 days. for that I have the below sql, I have not included the drop syntax in this.
I'm not able to rename with the date suffix in the below sql, syntax error at '+'
DECLARE
@TPartitionDate date
IF EXISTS (SELECT * FROM sysobjects WHERE Name = 'IIS_4')
BEGIN
SELECT
@TPartitionDate = MAX(PartitionDate)
FROM PartitionLog (NOLOCK)
EXEC sp_rename 'IIS_4','IIS_4_'+ @TPartitionDate
END

create table Test(sno int)
DECLARE
@TPartitionDate date = getdate()
declare @a varchar(200)
IF EXISTS (SELECT * FROM sysobjects WHERE Name = 'Test')
BEGIN
select @a='TEST_'+ cast(@TPartitionDate as varchar(10))
EXEC sp_rename 'TEST',@a
END
drop table [test_2015-04-23]
Hope it Helps!!

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