Need to add specific time to CTE_Dates calendar - sql

Question

I have a Dates CTE that allows me to fill in the dates between date stamped records. (Thanks SO!) However, I need the CTE_Dates table to time stamp its "StatusDate" column with a specific time instead of '00:00:00.000' and am not quite sure how to go about ding so. Here is the CTE_Dates code:
DECLARE #StartDate date = '07/15/2017'
DECLARE #EndDate date = '07/30/2017'
;WITH cte_Dates AS
(
SELECT
CASE WHEN DATEPART(DAY, #StartDate) = 1 THEN #StartDate ELSE DATEADD(Day, DATEDIFF(Day, 1, #StartDate) + 1, 0) END AS StatusDate
UNION ALL
SELECT DATEADD(Day, 1,StatusDate)
FROM cte_Dates
WHERE DATEADD(Day, 1, StatusDate) <= #EndDate
)
--this select statement actually pulls data from 2 CTE's that are joined but represents how I am pulling the StatusDate from CTE_Dates
select
CASE WHEN CAST(statusDate as Date) IS NULL
THEN LAG(cast(StatusDate as Date)) OVER (PARTITION BY item_no ORDER BY statStart)
ELSE StatusDate END as StatusDate,
SELECT * from cte_dates
Results:
StatusDate
2017-07-15 00:00:00.000
2017-07-16 00:00:00.000
2017-07-17 00:00:00.000
2017-07-18 00:00:00.000
2017-07-19 00:00:00.000
2017-07-20 00:00:00.000
2017-07-21 00:00:00.000
2017-07-22 00:00:00.000
2017-07-23 00:00:00.000
2017-07-24 00:00:00.000
2017-07-25 00:00:00.000
2017-07-26 00:00:00.000
2017-07-27 00:00:00.000
2017-07-28 00:00:00.000
2017-07-29 00:00:00.000
2017-07-30 00:00:00.000
The CTE works great! Except I need the timestamp to be noon...

Answer 1

Just add time value to date like this.
DECLARE #StartDate date = '07/15/2017'
DECLARE #EndDate date = '07/30/2017'
;WITH cte_Dates AS
(
SELECT
CASE WHEN DATEPART(DAY, #StartDate) = 1 THEN #StartDate ELSE DATEADD(Day, DATEDIFF(Day, 1, #StartDate) + 1, 0) END
+ '12:00'
AS StatusDate
UNION ALL
SELECT DATEADD(Day, 1,StatusDate)
FROM cte_Dates
WHERE DATEADD(Day, 1, StatusDate) <= #EndDate
)
SELECT * FROM CTE_Dates

Answer 2

You could use dateadd, adding 12 hours:
SELECT DATEADD(HOUR, 12, StatusDate) AS StatusDate FROM CTE_Dates

Answer 3

I would just use two CTEs:
DECLARE #StartDate date = '2017-07-15';
DECLARE #EndDate date = '2017-07-30';
DECLARE #time time = '04:00:00';
WITH cte_Dates AS (
SELECT CASE WHEN DATEPART(DAY, #StartDate) = 1 THEN #StartDate ELSE DATEADD(Day, DATEDIFF(Day, 1, #StartDate) + 1, 0) END AS StatusDate
UNION ALL
SELECT DATEADD(Day, 1,StatusDate)
FROM cte_Dates
WHERE DATEADD(Day, 1, StatusDate) <= #EndDate
),
cte_DateTimes as (
select cast(statusDate as datetime) + cast(#time as datetime)
from cte_Dates
)
SELECT *
FROM CTE_DateTimes;