mssql 30 minute time intervals beteen 2 datetime - sql-server

Question

I have below query and i want to get datetime in 30 min intervals between 2 datetime. Basicly I got it, but is limitited and wouln't return al results if the timediff is over 24 hrs.
For example:
#DateTime1 = 24/11/2016 18:00:00
#DateTime2 = 25/11/2016 06:00:00
Result: (in format "dd-HH:mm")
24-18:00
24-18:30
24-19:00
24-19:30
24-20:00
...
...
25-05:00
25-05:30
25-06:00
What I've tried.
SELECT number, DATEADD(MINUTE, number, #DateTime1) AS DateTimeLine, DATEPART(DAY, DATEADD(MINUTE, number, #DateTime1)) AS Days, DATEPART(MONTH,
DATEADD(MINUTE, number, #DateTime1)) AS Months, DATEPART(YEAR, DATEADD(MINUTE, number, #DateTime1)) AS Years, DATEPART(HOUR, DATEADD(MINUTE,
number, #DateTime1)) AS Hours, DATEPART(MINUTE, DATEADD(MINUTE, number, #DateTime1)) AS Minute, CAST(DATEADD(MINUTE, number, #DateTime1)
AS DATE) AS Date, CAST(DATEADD(MINUTE, number, #DateTime1) AS TIME) AS Time
FROM master.dbo.spt_values
WHERE (type = 'P') AND (DATEPART(MINUTE, DATEADD(MINUTE, number, #DateTime1)) = 30 OR DATEPART(MINUTE, DATEADD(MINUTE, number, #DateTime1)) = 0) AND (DATEADD(MINUTE, number, #DateTime1) <= #DateTime2)
ORDER BY number

Answer 1

A tally table is a great way to deal with this type of thing. I keep one in a view to avoid using spt_values.
create View [dbo].[cteTally] as
WITH
E1(N) AS (select 1 from (values (1),(1),(1),(1),(1),(1),(1),(1),(1),(1))dt(n)),
E2(N) AS (SELECT 1 FROM E1 a, E1 b), --10E+2 or 100 rows
E4(N) AS (SELECT 1 FROM E2 a, E2 b), --10E+4 or 10,000 rows max
cteTally(N) AS
(
SELECT ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) FROM E4
)
select N from cteTally
Then your code becomes really simple too. A small amount of datemath and voila.
declare #DateTime1 datetime = '2016/11/24 18:00:00'
, #DateTime2 datetime = '2016/11/25 06:00:00'
select FORMAT(DATEADD(minute, (t.N - 1) * 30, #DateTime1), 'dd-HH:mm')
from cteTally t
where t.N <= (DATEDIFF(hour, #DateTime1, #DateTime2) * 2) + 1

Answer 2

I have a TVF which generates dynamic date/time ranges. It is faster than a recursive cte, and I think more flexible. You pass the date range, desired DatePart, and increment.
Declare #DateTime1 DateTime = '2016-11-24 18:00:00'
Declare #DateTime2 DateTime = '2016-11-25 06:00:00'
Select Format(RetVal,'dd-HH:mm') from [dbo].[udf-Range-Date](#DateTime1,#DateTime2,'MI',30)
Returns
24-18:00
24-18:30
24-19:00
24-19:30
24-20:00
24-20:30
24-21:00
24-21:30
24-22:00
24-22:30
24-23:00
24-23:30
25-00:00
....
25-04:30
25-05:00
25-05:30
25-06:00
The UDF if needed
CREATE FUNCTION [dbo].[udf-Range-Date] (#R1 datetime,#R2 datetime,#Part varchar(10),#Incr int)
Returns Table
Return (
with cte0(M) As (Select 1+Case #Part When 'YY' then DateDiff(YY,#R1,#R2)/#Incr When 'QQ' then DateDiff(QQ,#R1,#R2)/#Incr When 'MM' then DateDiff(MM,#R1,#R2)/#Incr When 'WK' then DateDiff(WK,#R1,#R2)/#Incr When 'DD' then DateDiff(DD,#R1,#R2)/#Incr When 'HH' then DateDiff(HH,#R1,#R2)/#Incr When 'MI' then DateDiff(MI,#R1,#R2)/#Incr When 'SS' then DateDiff(SS,#R1,#R2)/#Incr End),
cte1(N) As (Select 1 From (Values(1),(1),(1),(1),(1),(1),(1),(1),(1),(1)) N(N)),
cte2(N) As (Select Top (Select M from cte0) Row_Number() over (Order By (Select NULL)) From cte1 a, cte1 b, cte1 c, cte1 d, cte1 e, cte1 f, cte1 g, cte1 h ),
cte3(N,D) As (Select 0,#R1 Union All Select N,Case #Part When 'YY' then DateAdd(YY, N*#Incr, #R1) When 'QQ' then DateAdd(QQ, N*#Incr, #R1) When 'MM' then DateAdd(MM, N*#Incr, #R1) When 'WK' then DateAdd(WK, N*#Incr, #R1) When 'DD' then DateAdd(DD, N*#Incr, #R1) When 'HH' then DateAdd(HH, N*#Incr, #R1) When 'MI' then DateAdd(MI, N*#Incr, #R1) When 'SS' then DateAdd(SS, N*#Incr, #R1) End From cte2 )
Select RetSeq = N+1
,RetVal = D
From cte3,cte0
Where D<=#R2
)
/*
Max 100 million observations -- Date Parts YY QQ MM WK DD HH MI SS
Syntax:
Select * from [dbo].[udf-Range-Date]('2016-10-01','2020-10-01','YY',1)
Select * from [dbo].[udf-Range-Date]('2016-01-01','2017-01-01','MM',1)
*/

Answer 3

using a recursive Common Table Expression [CTE] is one pretty clean method. For the formatting I am showing FORMAT() from SQL-Server 2012+ you may consider using DATEPART etc to do it though as FORMAT() can have performance impact.
I do agree with #RossBush's comment if you do things like this a lot generating a calendar (dates) and a time dimensions is very helpful for these purposes.
DECLARE #DateTime1 DATETIME = '2016/11/24 18:00:00'
DECLARE #DateTime2 DATETIME = '2016/11/25 06:00:00'
;WITH cte30MinIncrements AS (
SELECT #DateTime1 as DT
UNION ALL
SELECT DATEADD(MINUTE,30,DT)
FROM
cte30MinIncrements
WHERE DATEADD(MINUTE,30,DT) <= #DateTime2
)
SELECT
*
,FORMAT(DT,'dd-HH:mm') as Formated
FROM
cte30MinIncrements

Answer 4

Please see if this works.
declare #DateTime1 DateTime = '2016-11-24 18:00:00'
declare #DateTime2 DateTime = '2016-11-25 18:00:00'
declare #Interval DateTime = #DateTime1
declare #vartmptable table(DT DateTime)
While (#Interval < #DateTime2)
begin
--select #Interval, FORMAT(#Interval,'dd-HH:mm')
insert into #vartmptable select #Interval
set #Interval = DATEADD(mi,30,#Interval)
end
select FORMAT(DT,'dd-HH:mm') from #vartmptable

Answer 5

What about this? You can use variables/ fixed values as necessary.
WITH CTE_Numbers
AS (
SELECT n = 1
UNION ALL
SELECT n + 1
FROM CTE_Numbers
WHERE n < 100
)
SELECT FORMAT(DATEADD(mi, n * 30, '2016/11/03'),'dd-HH:mm')
FROM CTE_Numbers