MS SQL Dynamic Stored Procedure Using A Datetime Variable

Hi I'm new to MS SQL and trying to write a very small dynamic stored procedure which is giving me a headache.

What I have is:


CREATE PROCEDURE busy_report

@TableName varchar(255),
@reporteddate datetime=NULL

AS
if @reporteddate is null
select @reporteddate = CURRENT_TIMESTAMP

-- Create a variable @SQLStatement
DECLARE @SQLStatement varchar(255)
SET DATEFORMAT dmy

-- Enter the dynamic SQL statement into the
-- variable @SQLStatement
SELECT @SQLStatement = "SELECT vendor, reporteddate, count(vendor) FROM " +
@TableName + "WHERE reporteddate = ' "
+ @reporteddate + " '"


-- Execute the SQL statement
EXEC(@SQLStatement)
GO

The error I keep getting is:

Server: Msg 8114, Level 16, State 4, Procedure busy_report, Line 0
Error converting data type varchar to datetime.

Any ideas appreciated.

(Edit:)

I've also tried it this way:


CREATE PROCEDURE UK_busy_report

@TableName varchar(255),
@reporteddate datetime=NULL

AS

-- Create a variable @SQLStatement
DECLARE @SQLStatement varchar(255)
SELECT @reporteddate=CONVERT(datetime, @reporteddate)
IF @@ERROR <> 0 BEGIN

/* Do some error processing */

PRINT 'Error Occured' END

ELSE
-- Enter the dynamic SQL statement into the
-- variable @SQLStatement
SELECT @SQLStatement = "SELECT vendor, reporteddate, count(vendor) FROM " +
@TableName + "WHERE reporteddate = ' "
+ @reporteddate + " '"


-- Execute the SQL statement
EXEC(@SQLStatement)
GO

Which gives me the same error!

.logic.