Prompt User For Data

I need to prompt a user for start and end dates as well
as start and end times using a specific format for the
date and time.

I am having difficulty constructing the query.

So far I have...

DECLARE @StartDate DATETIME
DECLARE @EndDate DATETIME
DECLARE @StartTime DATETIME
DECLARE @EndTime DATETIME

SELECT I.IncidentId,
I.CFScompanyname,
I.New_created_time,
E.createdon

FROM dbo.IncidentExtensionBase I
INNER JOIN dbo.IncidentBase E on I.IncidentId = E.IncidentId

WHERE E.createdon >= @StartDate AND
E.createdon <= @EndDate AND
E.createdon >= @StartTime AND
E.createdon <= @EndTime;

Could someone please let me know how I prompt the user for this data.

Thank you very much.