Let the user select how many days of data he wants

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I want to display current days data only. Currently my data is in UTC time and the way I wrote my query looks like it's not show my current days data. Instead it's showing me data which include yesterday's data too. I have declared @Days where the user will set the number of days they want the data from. Like if today is the the 10th and is currently 5pm, I want the data from midnight till 5pm only for the 10th. But when I set @Days = -1, it's actually going back and showing me data from 5pm on the 9th to 5pm of the 10th. But I want if the user selects @Days = -7, it'll show data for the last SEVEN DAYS ONLY(i.e. from 4th midnight to 5pm of the 10th) not last 7 * 24 = 168 hours from now.

What I have tried:

declare @Days int

set @Days = -1

select      

dateadd(hour,datepart(hour,Timestamp),cast(CAST((Timestamp) as date) as datetime)) as [Time]      

from  [Employee]

where dateadd(hour,datepart(hour,Timestamp),cast(CAST((Timestamp) as date) as datetime)) >= DATEADD(day, @Days , GETDATE()))

Posted 25-Jul-18 10:33am

Member 13863605

Updated 25-Jul-18 10:52am

v3

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C Pottinger · Accepted Answer · 2018-07-25T10:45:00

where dateadd(hour,datepart(hour,Timestamp),cast(CAST((Timestamp) as date) as datetime)) >= DATEADD(D, 0, DATEDIFF(D, 0, DATEADD(day, @Days + 1, GETDATE()))))

this will remove the hours portion from the date you are comparing against, so that your comparision becomes where employeedate >= startofday

In other words:

DATEADD(D, 0, DATEDIFF(D, 0, @sometimestamp))

selects the start of day for @sometimestamp