Convert month name to month number in SQL Server - sql-server

Question

In T-SQL what is the best way to convert a month name into a number?
E.g:
'January' -> 1
'February' -> 2
'March' -> 3
Etc.
Are there any built in functions that can do this?

Answer 1

How about this?
select DATEPART(MM,'january 01 2011') -- returns 1
select DATEPART(MM,'march 01 2011') -- returns 3
select DATEPART(MM,'august 01 2011') -- returns 8

Answer 2

How about this:
SELECT MONTH('March' + ' 1 2014')
Would return 3.

Answer 3

Its quit simple,
Take the first 3 digits of the month name and use this formula.
Select charindex('DEC','JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC')/4+1

Answer 4

SELECT DATEPART(MM,'january '+'01 1900')
SELECT MONTH('january ' + '01 1900')
SELECT month(dateadd(month,DATEDIFF(month,0,'january 01 2015'),0))

Answer 5

You can create a function and then refer to it in the select statement.
The function may look similar to this:
if OBJECT_ID('fn_month_name_to_number', 'IF') is not null
drop function fn_month_name_to_number
go
create function fn_month_name_to_number (#monthname varchar(25))
returns int as
begin
declare #monthno as int;
select #monthno =
case #monthname
when 'January' then 1
when 'February' then 2
when 'March' then 3
when 'April' then 4
when 'May' then 5
when 'June' then 6
when 'July' then 7
when 'August' then 8
when 'September' then 9
when 'October' then 10
when 'November' then 11
when 'December' then 12
end
return #monthno
end
Then you can query it.
select fn_month_name_to_number ('February') as month_no
This query will return 2 as month number.
You can pass values from a column as parameters to the function.
select fn_month_name_to_number (*columnname*) as month_no from *tablename*
Have a good day!

Answer 6

There is no built in function for this.
You could use a CASE statement:
CASE WHEN MonthName= 'January' THEN 1
WHEN MonthName = 'February' THEN 2
...
WHEN MonthName = 'December' TNEN 12
END AS MonthNumber
or create a lookup table to join against
CREATE TABLE Months (
MonthName VARCHAR(20),
MonthNumber INT
);
INSERT INTO Months
(MonthName, MonthNumber)
SELECT 'January', 1
UNION ALL
SELECT 'February', 2
UNION ALL
...
SELECT 'December', 12;
SELECT t.MonthName, m.MonthNumber
FROM YourTable t
INNER JOIN Months m
ON t.MonthName = m.MonthName;

Answer 7

I recently had a similar experience (sql server 2012). I did not have the luxury of controlling the input, I just had a requirement to report on it. Luckily the dates were entered with leading 3 character alpha month abbreviations, so this made it simple & quick:
TRY_CONVERT(DATETIME,REPLACE(obs.DateValueText,SUBSTRING(obs.DateValueText,1,3),CHARINDEX(SUBSTRING(obs.DateValueText,1,3),'...JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC')/4))
It worked for 12 hour:
Feb-14-2015 5:00:00 PM 2015-02-14 17:00:00.000
and 24 hour times:
Sep-27-2013 22:45 2013-09-27 22:45:00.000
(thanks ryanyuyu)

Answer 8

I think you may even have a separate table like a monthdetails (Monthno int, monthnames char(15)) and include values:
1 January
2 February
.... and so on, and then join this table with your existing table in the monthnames column
SELECT t1.*,t2.Monthno from table1
left outer join monthdetails t2
on t1.monthname=t2.monthnames
order by t2.Monthno

Answer 9

You can use below code
DECLARE #T TABLE ([Month] VARCHAR(20))
INSERT INTO #T
SELECT 'January'
UNION
SELECT 'February'
UNION
SELECT 'March'`
SELECT MONTH('01-' + [Month] + '-2010') As MonthNumeric,[Month] FROM #T
ORDER BY MonthNumeric

Answer 10

You can try sth like this, if you have month_name which is string datetype.After converting, you can feel free to order by Month.
For example, your table like this:
month
Dec
Jan
Feb
Nov
Mar
.
.
.
My syntax is:
Month(cast(month+'1 2016' as datetime))

Answer 11

You can do it this way, if you have the date (e.g. SubmittedDate)
DATENAME(MONTH,DATEADD(MONTH, MONTH(SubmittedDate) - 1, 0)) AS ColumnDisplayMonth
Or you can do it this way, if you have the month as an int
DATENAME(MONTH,DATEADD(MONTH, #monthInt - 1, 0)) AS ColumnDisplayMonth

Answer 12

I know this may be a bit too late but the most efficient way of doing this through a CTE as follows:
WITH Months AS
(
SELECT 1 x
UNION all
SELECT x + 1
FROM Months
WHERE x < 12
)
SELECT x AS MonthNumber, DateName( month , DateAdd( month , x , -1 )) AS MonthName FROM Months

Answer 13

try this
SELECT EXTRACT(MONTH FROM TO_DATE(month_added, 'Month')) AS month_number

Answer 14

select Convert(datetime, '01 ' + Replace('OCT-12', '-', ' '),6)