Context

Working with DateTime fields in MSSQL is not the same as you do in .NET. I found myself googling the same things over and over. That’s why I decided to group the things I need most in one blogpost. This way I don’t have to keep googling, I just need to browse my blog and voilà.

I will update this blogpost when I’m in need of different functionalities.

Comparing the date part of DateTime fields

You shouldn’t cast or convert your DateTime fields to text and then do a text compare like:

SELECT CASE WHEN CONVERT(varchar(10), getdate(), 101) = CONVERT(varchar(10), getdate(), 101) THEN 'Equal' ELSE 'Different' END AS 'Compare result'

You should use the DateTime methods provided by Microsoft:

SELECT CASE WHEN DATEDIFF(d, getdate(), getdate()) = 0 THEN 'Equal' ELSE 'Different' END AS 'Compare result'

The DATEDIFF method accepts a datepart argument. The method will base its result on the supplied datepart argument. More info: DATEDIFF on MSDN

Displaying DateTime fields

I found this example on the internet:

SELECT DATEADD(dd, -DATEDIFF(dd, getdate(), 1), 1) -- 2010-08-02 00:00:00.000

I don’t find it very useful to put this in a SELECT statement, maybe when you’re using subqueries to be sure it will be parsed as a DateTime. Again, use the provided methods. In this case it would be the Convert. It’s always nice to see an example result, so here it goes:

SELECT CONVERT(varchar(50), getdate(), 100) -- Aug  2 2010 10:40AM
SELECT CONVERT(varchar(50), getdate(), 101) -- 08/02/2010
SELECT CONVERT(varchar(50), getdate(), 102) -- 2010.08.02
SELECT CONVERT(varchar(50), getdate(), 103) -- 02/08/2010
SELECT CONVERT(varchar(50), getdate(), 104) -- 02.08.2010
SELECT CONVERT(varchar(50), getdate(), 105) -- 02-08-2010
SELECT CONVERT(varchar(50), getdate(), 106) -- 02 Aug 2010
SELECT CONVERT(varchar(50), getdate(), 107) -- Aug 02, 2010
SELECT CONVERT(varchar(50), getdate(), 108) -- 10:40:10
SELECT CONVERT(varchar(50), getdate(), 109) -- Aug  2 2010 10:40:10:870AM
SELECT CONVERT(varchar(50), getdate(), 110) -- 08-02-2010
SELECT CONVERT(varchar(50), getdate(), 111) -- 2010/08/02
SELECT CONVERT(varchar(50), getdate(), 112) -- 20100802
SELECT CONVERT(varchar(50), getdate(), 113) -- 02 Aug 2010 10:40:10:870
SELECT CONVERT(varchar(50), getdate(), 114) -- 10:40:10:870