Calculate Latest Transaction Date Time

Need the correct way to Calculate LastTransaction Date Time

--What i have written, Time also should be added to date.

Showng wrong Value

Expected Result

--Create Table Scripts

--USE DB
GO
Create Schema PowerBiTest

DROP TABLE IF EXISTS PowerBiTest.D_SalesHeader
DROP TABLE IF EXISTS PowerBiTest.D_Store
DROP TABLE IF EXISTS PowerBiTest.D_Date
DROP TABLE IF EXISTS PowerBiTest.D_Customer
DROP TABLE IF EXISTS PowerBiTest.F_Sales

CREATE TABLE PowerBiTest.D_SalesHeader
(
BK_HeaderID INT
,SalesTransactionDate Date
,SalesTrnsactionTime Time
)
CREATE TABLE PowerBiTest.D_Store
(
BK_StoreName Varchar(100)
)
CREATE TABLE PowerBiTest.D_Date
(
BK_DATE Date
)
CREATE TABLE PowerBiTest.D_Customer
(
BK_CustName Varchar(200)
)
CREATE TABLE PowerBiTest.F_Sales
(
FK_HeaderID INT
,FK_StoreID VARCHAR(100)
,FK_DateID DATE
,FK_CustID Varchar(200)
,LineId INT
,SaleAmount MONEY
)

INSERT INTO PowerBiTest.D_SalesHeader(BK_HeaderID,SalesTransactionDate,SalesTrnsactionTime)
VALUES(101,'20231201','10:44:57.6133333'),
(102,'20231201','11:10:15.4115111'),
(103,'20231201','13:22:45.1211000'),
(104,'20231202','11:00:00.4115111'),
(105,'20231202','15:15:00.2115111'),
(106,'20231203','17:01:00.3312444')

INSERT INTO PowerBiTest.D_Store(BK_StoreName)
VALUES('HYD'),('BLR'),('CHN')

INSERT INTO PowerBiTest.D_Customer(BK_CustName)
VALUES('AAA'),('BBB'),('CCC'),('DDD'),('EEE')

INSERT INTO PowerBiTest.D_Date(BK_DATE)
VALUES('20231201'),('20231202'),('20231203'),('20231204'),('20231205')

INSERT INTO PowerBiTest.F_Sales
VALUES(101,'HYD','20231201','AAA',1,10.00),
(101,'HYD','20231201','AAA',2,20.00),
(103,'HYD','20231201','BBB',1,25.00),
(104,'BLR','20231202','BBB',1,45.00),
(105,'CHN','20231202','CCC',1,45.00),
(106,'HYD','20231203','AAA',1,50.00)