T-SQL stored procedure date variable - sql-server

Question

I have this T-SQL stored procedure:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE dbo.datealter
#LastChangeDate AS date
AS
BEGIN
SELECT
s.[DivNo]as Division,
SUM(CASE WHEN s.Date = #LastChangeDate
THEN s.SELLINC ELSE 0 END) ActualSales
FROM
[dbo].[NewLayerReports] s
WHERE
s.BRN = 1
GROUP BY
s.[DivNo]
END
GO
When I execute this it works ok.
I am using this stored procedure in a SSRS report. When I execute the SSRS report, it asks me to enter or pick the date.
Here always I wanted a calendar to show last year current month. For example, If I run the report on November 2016 the calendar should show Nov 2015.
How can we do this please?
In SSRS parameter, if I set default value then, I couldn't edit the date value. Please see the picture,

Answer 1

You can give default value to your parameter. Give expression in your default value for parameter as Date.Now.Date.AddYears(-1). It will show same month in previous year when you run the report.

Answer 2

If you want to set the default value of a parameter in SSRS, right click on the Parameter and select Properties. In the Default Value screen you can set the expression that returns the date.
To get this day last year, you can use:
=today.AddYears(-1)
Though if you want the start of the month you also need to add the days as well:
=today.AddYears(-1).AddDays(1-today.day())
If appears you just want to display the date relative to the one the user picked. In that case you can use the above expressions as required within a report element (such as a title at the top of the report), but replace any instance of today with Parameters!ParameterName.Value.