Convert date to YYYYMM format

问题:

I want to select value = 201301

select getdate(), cast(datepart(year, getdate()) as varchar(4))+cast(datepart(MONTH, getdate()) as varchar(2))

it returns 20131

what is the normal way to do this?

回答1:

SELECT LEFT(CONVERT(varchar, GetDate(),112),6)

回答2:

SELECT CONVERT(nvarchar(6), GETDATE(), 112)

回答3:

I know it is an old topic, but If your SQL server version is higher than 2012.

There is another simple option can choose, FORMAT function.

SELECT FORMAT(GetDate(),'yyyyMM')

sqlfiddle

回答4:

Actually, this is the proper way to get what you want, unless you can use MS SQL 2014 (which finally enables custom format strings for date times).

To get yyyymm instead of yyyym, you can use this little trick:

select 
 right('0000' + cast(datepart(year, getdate()) as varchar(4)), 4)
 + right('00' + cast(datepart(month, getdate()) as varchar(2)), 2)

It's faster and more reliable than gettings parts of convert(..., 112).

回答5:

You can convert your date in many formats, for example :

CONVERT(NVARCHAR(10), DATE_OF_DAY, 103) => 15/09/2016
CONVERT(NVARCHAR(10), DATE_OF_DAY, 3) => 15/09/16

Syntaxe :

CONVERT('TheTypeYouWant', 'TheDateToConvert', 'TheCodeForFormating' * )

• The code is an integer, here 3 is the third formating without century, if you want the century just change the code to 103.

In your case, i've just converted and restrict size by nvarchar(6) like this :

CONVERT(NVARCHAR(6), DATE_OF_DAY, 112) => 201609

See more at : http://www.w3schools.com/sql/func_convert.asp

回答6:

A more efficient method, that uses integer math rather than strings/varchars, that will result in an int type rather than a string type is:

SELECT YYYYMM = (YEAR(GETDATE()) * 100) + MONTH(GETDATE())

Adds two zeros to the right side of the year and then adds the month to the added two zeros.

回答7:

It's month 1, so you're getting an expected value. you'll have to zeropad the month (1 -> 01), as per this answer: How do I convert an int to a zero padded string in T-SQL?