Query for difference between dates

I know I can use the DATEDIFF
How can I write it if StartDate and EndDate are in these formats?
StartDate: 2006-09-20 00:00:00.000
EndDate:   2013-09-20 18:20:53.000
I want to find the number of days between dates of dates in the two columns

Those work great, What if I want to use values from a table?
I have a column called StartDate and a column called EndDate with dates in it. I just what it to show the StartDate in a column, the Endate in column and the number of days in a column.
Hi,
Based on your description, do you want to display the following result?
USE <DatabaseName>
GO
--Create a table named DateTest
CREATE TABLE DateTest
(StartDate datetime,
EndDate datetime
INSERT INTO DateTest
VALUES ('2006-09-20 00:00:00.000','2013-09-20 18:20:53.000'),
('2007-05-06 12:10:09.000','2008-05-07 12:10:09.000'),
('2007-05-07 09:53:01.000','2009-05-08 09:53:01.000'),
('2008-08-07 05:53:01.000','2010-08-08 05:53:01.000')
-- Create another table named DateTest1
SELECT DateTest.StartDate, DateTest.EndDate,
DATEDIFF(DAY,DateTest.StartDate,DateTest.EndDate) AS days_number INTO DateTest1
FROM DateTest
SELECT *FROM DateTest1
--Below is the result
StartDate EndDate days_number
2006-09-20 00:00:00.000 2013-09-20 18:20:53.000 2557
2007-05-06 12:10:09.000 2008-05-07 12:10:09.000 367
2007-05-07 09:53:01.000 2009-05-08 09:53:01.000 732
2008-08-07 05:53:01.000 2010-08-08 05:53:01.000 731
Thanks,
Lydia Zhang

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