日期时间比较操作

Question

I have these record in my database :

the date column type in datetime

Also i have a query for fetching some records from the table :

SELECT count(*) 
FROM Availibility 
WHERE [date]>= @StartDate AND [date]<=@EndDate

And this is screen shot from the result :

I expected to have Count(*) = 5 but i got 4 !!! What's my mistake?

UPDATE

Changing SELECT COUNT(*) to SELECT * :

And these are the latest records :

Also if i change second from 58 to 56 , i got 5 results!!!

Trying to rebuild of index by this query :

alter index all on Availibility rebuild

But the results are same and i have 4 records for some seconds.

Answer 1

Test Code:

create table Availability
(
  [date] datetime not null
)

insert Availability ([date]) select '2014-07-19 02:02:57.000'
union select '2014-07-19 02:03:57.000'
union select '2014-07-19 02:04:57.000'
union select '2014-07-19 02:05:57.000'
union select '2014-07-19 02:06:57.000'
union select '2014-07-19 02:07:57.000'
union select '2014-07-19 02:08:57.000'
union select '2014-07-19 02:09:57.000'
union select '2014-07-19 02:10:57.000'
union select '2014-07-19 02:11:57.000'
union select '2014-07-19 02:12:57.000'

declare @startDate datetime = '2014-07-19 02:07:58.000'
, @endDate datetime = '2014-07-19 02:12:58.000'

select * 
from Availability
where [date] between @startDate and @endDate