Bagaimana cara mengubah jam DATEPART yang merupakan waktu militer untuk tengah malam (00) ke nilai yang dapat saya gunakan saat saya membutuhkannya untuk perhitungan?

Jika saya tidak melewatkan apa pun, inilah yang dapat Anda coba alih-alih loop Anda:

DECLARE
  @StartTime time,
  @EndTime   time;

SET @StartTime = '22:30:00';
SET @EndTime   = '00:52:00';

WITH timerange AS (
  SELECT
    StartTime = CAST(@StartTime AS datetime),
    EndTime   = DATEADD(
      DAY,
      CASE WHEN @StartTime > @EndTime THEN 1 ELSE 0 END,
      CAST(@EndTime AS datetime)
    )
),
hourly AS (
  SELECT
    n.number,
    t.StartTime,
    t.EndTime,
    HStart = DATEADD(HOUR, DATEDIFF(HOUR, 0, t.StartTime) + n.number    , 0),
    HEnd   = DATEADD(HOUR, DATEDIFF(HOUR, 0, t.StartTime) + n.number + 1, 0)
  FROM timerange t
    INNER JOIN master..spt_values n
      ON n.number BETWEEN 0 AND DATEDIFF(HOUR, t.StartTime, t.EndTime)
  WHERE n.type = 'P'
),
hourly2 AS (
  SELECT
    number,
    HStart = CASE WHEN StartTime > HStart THEN StartTime ELSE HStart END,
    HEnd   = CASE WHEN EndTime   < HEnd   THEN EndTime   ELSE HEnd   END
  FROM hourly
)
SELECT
  StartHour   = DATEPART(HOUR  , HStart),
  StartMinute = DATEPART(MINUTE, HStart),
  EndHour     = DATEPART(HOUR  , HEnd  ),
  EndMinute   = DATEPART(MINUTE, HEnd  ),
  StartTime   = CAST(HStart AS time),
  EndTime     = CAST(HEnd   AS time)
FROM hourly2
ORDER BY number
;

Output yang dihasilkan adalah sebagai berikut:

StartHour   StartMinute EndHour     EndMinute   StartTime        EndTime
----------- ----------- ----------- ----------- ---------------- ----------------
22          30          23          0           22:30:00.0000000 23:00:00.0000000
23          0           0           0           23:00:00.0000000 00:00:00.0000000
0           0           0           52          00:00:00.0000000 00:52:00.0000000