Date/Time Conversions Using SQL Server

Problem
There are many instances when dates and times don't show up at your doorstep in the format you'd like it to be, nor does the output of a query fit the needs of the people viewing it. One option is to format the data in the application itself. Another option is to use the built-in functions SQL Server provides to format the date string for you.

Solution
SQL Server provides a number of options you can use to format a date/time string. One of the first considerations is the actual date/time needed. The most common is the current date/time using getdate(). This provides the current date and time according to the server providing the date and time. If a universal date/time is needed, then getutcdate() should be used. To change the format of the date, you convert the requested date to a string and specify the format number corresponding to the format needed. Below is a list of formats and an example of the output:

DATE FORMATS
Format #	Query (current date: 12/30/2006)	Sample
1	select convert(varchar, getdate(), 1)	12/30/06
2	select convert(varchar, getdate(), 2)	06.12.30
3	select convert(varchar, getdate(), 3)	30/12/06
4	select convert(varchar, getdate(), 4)	30.12.06
5	select convert(varchar, getdate(), 5)	30-12-06
6	select convert(varchar, getdate(), 6)	30 Dec 06
7	select convert(varchar, getdate(), 7)	Dec 30, 06
10	select convert(varchar, getdate(), 10)	12-30-06
11	select convert(varchar, getdate(), 11)	06/12/30
101	select convert(varchar, getdate(), 101)	12/30/2006
102	select convert(varchar, getdate(), 102)	2006.12.30
103	select convert(varchar, getdate(), 103)	30/12/2006
104	select convert(varchar, getdate(), 104)	30.12.2006
105	select convert(varchar, getdate(), 105)	30-12-2006
106	select convert(varchar, getdate(), 106)	30 Dec 2006
107	select convert(varchar, getdate(), 107)	Dec 30, 2006
110	select convert(varchar, getdate(), 110)	12-30-2006
111	select convert(varchar, getdate(), 111)	2006/12/30
TIME FORMATS
8 or 108	select convert(varchar, getdate(), 8)	00:38:54
9 or 109	select convert(varchar, getdate(), 9)	Dec 30 2006 12:38:54:840AM
14 or 114	select convert(varchar, getdate(), 14)	00:38:54:840

You can also format the date or time without dividing characters, as well as concatenate the date and time string:

Sample statement	Output
select replace(convert(varchar, getdate(),101),'/','')	12302006
select replace(convert(varchar, getdate(),101),'/','') + replace(convert(varchar, getdate(),108),':','')	12302006004426

Next Steps

The formats listed above are not inclusive of all formats provided. Experiment with the different format numbers to see what others are available

These formats can be used for all date/time functions, as well as data being served to clients, so experiment with these data format conversions to see if they can provide data more efficiently

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