一周中特定小时部分的数据总和-MS SQL查询

为了找到一个星期的数据总和（在我的情况下为CallsAnswered），但从6 PM到12 AM之间是特定的小时数，我在下面设置了一个查询，但是它跳过了示例数据中的一天数据。您能否验证我的查询，并帮助我找到失踪的地方？

创建查询：

Create Table tblSingleBox (ScanDate DateTime, SkillTargetID Varchar(10), CallsAnswered int)

插入查询

Insert into tblSingleBox 
Values ('2018-02-18 19:17:01', '10888', 32),
('2018-02-18 23:59:59', '10888', 01),
('2018-02-19 00:10:01', '10888', 15),
('2018-02-19 17:59:59', '10889', 12),
('2018-02-19 20:59:59', '10889', 90),
('2018-02-25 21:59:59', '10889', 40)

查询：

SELECT convert(varchar(10),ScanDate,101)ScanDate,SkillTargetID, SUM(CallsAnswered)CallsAnswered
FROM    tblSingleBox (nolock)
WHERE    DATEPART(Hour, scandate) between 18 and 24
    and (scandate between '2018-02-18' and '2018-02-25')
GROUP BY    convert(varchar(10),ScanDate,101) ,SkillTargetID
order by convert(varchar(10),ScanDate,101)

预期产量：

ScanDate    SkillTargetID   CallsAnswered
18-02-2018  10888   33
18-02-2018  10889   11
19-02-2018  10889   90
25-02-2018  10889   40

我得到的实际输出是：

ScanDate    SkillTargetID   CallsAnswered
02/18/2018  10888   33
02/18/2018  10889   11
02/19/2018  10889   90