Thanks to this website for the information:

http://www.databasejournal.com/features/mssql/article.php/1442021

-- The syntax for pulling a certain part of a DATETIME is:
--
-- CONVERT(date_type[(length)],expression[,style])
--
-- The available styles are as follows:
--
-- NULL  Jun 24 2001 9:48PM
-- 1     06/24/01
-- 101   06/24/2001
-- 2     01.06.24
-- 104   24.06.2001
-- 108   21:48:00
-- 112   20010624
-- 121   2001-06-24 21:48:00.000

-- Some example usage:
SELECT CONVERT(DATETIME,GETDATE(),112) as date
-- Will output in YYYYMMDD format
SELECT CONVERT(DATETIME,client.birthday,101) as birthday
-- Will output in MM/DD/YYYY format