dynamic pivot with parameter passed in - sql

Question

I have created this stored procedure that works when hard coded
(in the where clause at #WeekStart and #WeekEnd),
If I try to add parameters to the query #WeekStart and #WeekEnd I get the following error:
Must declare the scalar variable "#WeekStart".
My goal is to do do something like this instead of having to hard code it:
exec dbo.GetTotals #WeekStart='2022-04-11',#WeekEnd='2022-04-25'
The stored procedure:
CREATE PROCEDURE [dbo].[GetTotals]
#WeekStart Date,
#WeekEnd Date
AS
begin
set nocount on;
--get row names
DECLARE
#columns NVARCHAR(MAX) = '',
#sql NVARCHAR(MAX) = '';
-- select the category names
SELECT
#columns+=QUOTENAME(DepartmentName) + ','
FROM
DepartmentTable
ORDER BY
DepartmentName;
--set#colums variable
SET #columns = LEFT(#columns, LEN(#columns) - 1);
-- construct dynamic SQL
SET #sql ='
SELECT * FROM
(
select
JobCode,
DepartmentName,
(COALESCE(MonTime, 0)+COALESCE(TueTime, 0)+COALESCE(WenTime, 0)+COALESCE(ThurTime, 0)+COALESCE(FriTime, 0)
+COALESCE(SatTime, 0)+COALESCE(SunTime, 0)) as total
from TimeSheetTable
INNER JOIN DepartmentTable ON TimeSheetTable.DeptId=DepartmentTable.Id
inner join JobCodeTable on TimeSheetTable.JobId=JobCodeTable.Id
--This Works--
-- Where WeekStartDate Between ''2022-04-11'' and ''2022-04-11'' --
--This is throwing an erro--
Where WeekStartDate Between #WeekStart and #WeekEnd
) t
PIVOT(
sum(total)
FOR DepartmentName IN ('+ #columns +')
)pivot_table
ORDER BY JobCode
'
---- execute the dynamic SQL
EXECUTE sp_executesql #sql;
end

Answer 1

exec sp_executesql #Sql, N' #WeekStart Date, #WeekEnd Date', #WeekStart = #WeekStart, #WeekEnd = #WeekEnd