Convert date time in SQL - sql-server

Question

I would like to find out which user are late clock in example clock in time on 9:00Am more than 9:00am declare as late but my result show me more than 10:00Am just count as late
DECLARE #clockin as varchar
DECLARE #clockout as varchar
DECLARE #reportdate as datetime
--SET #clockin = CONVERT(108,'08:30')
SET #clockin = CONVERT(varchar(10),CAST('9:00' AS TIME),100)
SET #clockout = CONVERT(varchar(10),CAST('18:30' AS TIME),100)
SET #reportdate = month(GETDATE())
SELECT
u.showname AS showname,
l.USERID AS USERID,
u.BADGENUMBER AS BADGENUMBER,
l.CHECKTIME AS CHECKTIME,
CASE
WHEN DATEPART(HOUR, l.CHECKTIME) <= #clockin
THEN CONVERT(varchar(10), CAST(l.CHECKTIME AS TIME), 100)
ELSE 'late ' + CONVERT(varchar(100), CAST(l.CHECKTIME AS TIME), 100)
END AS Time
FROM
CHECKINOUT l
INNER JOIN
USERINFO u ON l.USERID = u.USERID
WHERE
u.showname IS NOT NULL
AND u.BADGENUMBER > 100
AND CHECKTIME >= '1 jan 2017'
AND CHECKTIME <= '31 jan 2017'
--GROUP BY l.USERID, u.showname, u.BADGENUMBER
ORDER BY
u.BADGENUMBER
Result

Answer 1

To compare with time not just 'hour'!
DECLARE #clockin as TIME
DECLARE #clockout as TIME
DECLARE #reportdate as datetime
SET #clockin = CAST('9:00' AS TIME)
SET #clockout = CAST('18:30' AS TIME)
SET #reportdate = month(GETDATE())
SELECT
u.showname, l.USERID, u.BADGENUMBER, l.CHECKTIME,
CASE
WHEN CAST(l.CHECKTIME AS TIME) < = #clockin
THEN CONVERT(VARCHAR(10), CAST(l.CHECKTIME AS TIME), 100)
ELSE 'late ' + CONVERT(VARCHAR(100), CAST(l.CHECKTIME AS TIME), 100)
END AS Time
FROM
CHECKINOUT l
INNER JOIN
USERINFO u ON l.USERID = u.USERID
WHERE
u.showname IS NOT NULL
AND u.BADGENUMBER > 100
AND CHECKTIME >= '1 jan 2017'
AND CHECKTIME <= '31 jan 2017'
ORDER BY
u.BADGENUMBER

Answer 2

All you have to do is remove the equal sign. The person arrived at nine so they are not late because that equals the start time. You can also subract 59 seconds to the check in time so 9:00:30 am doesn't show as late.
I would recommend using a separate field for late flag so people can use this data in other reports more easily in excel or whatever: if the person is late how much are they late by stuff like that
Select
u.showname, l.USERID, u.BADGENUMBER, l.CHECKTIME,
case
when datepart(HOUR,l.CHECKTIME) < #clockin