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Date Format


Date Format

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zulmanclock
zulmanclock
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No problem. Thank you for your comments.
Steven Willis
Steven Willis
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Here's a similar function with more options that is an inline tvf rather than scalar. The benefits of that should be obvious. I didn't write the original code (and can't remember who did), but I did add quite a few of the options and turned it into an itvf.



CREATE FUNCTION [dbo].[itvfFormatDateWithMask]
(
@date AS DATETIME
,@format_string VARCHAR(50)
)
RETURNS TABLE
AS
RETURN
(

/*

SELECT * FROM dbo.itvfFormatDateWithMask(GETDATE(),'YYYY-MM-DD HH:mm:ss.fff')
SELECT * FROM dbo.itvfFormatDateWithMask(GETDATE(),'MMMM Dx, YYYY hh:mmtt')
SELECT * FROM dbo.itvfFormatDateWithMask(GETDATE(),'MMM Dx, YYYY')

'YYYY' - full year with century
'YY' - year without century
'Y' - last digit of year
'MMMM' - month name
'MMM' - month name first 3 chars only
'MM' - month number with leading zero
'M' - month number without leading zero)
'DDDD' - day name
'DD' - day number with leading zero
'D' - day number without leading zero
'HH' - hour with leading zero (24 hr format)
'H' - hour without leading zero
'hh' - hour with leading zero (12 hr format)
'h' - hour without leading zero (12 hr format)
'mm' - minutes with leading zero
'm' - minutes without leading zero
'ss' - seconds with leading zero
's' - seconds without leading zero
'fff' - milliseconds with leading zeros
'f' - milliseconds without leading zeros
'tt' - AM or PM
't' - A or P
'x' - st, nd, or th

*/

WITH fourRows(N)
AS (
SELECT 1
UNION ALL
SELECT 2
UNION ALL
SELECT 3
UNION ALL
SELECT 4
)
,cteTally(N)
AS (
SELECT TOP (50)
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) AS RowNum
FROM
fourRows AS A
CROSS JOIN fourRows AS B
CROSS JOIN fourRows AS C
ORDER BY 1
)
,tokenizedString
AS (
SELECT
N
,REPLACE(C,SUBSTRING(CAST(C AS NVARCHAR(50)),CHARINDEX('""',CAST(C AS NVARCHAR(50)),1),CHARINDEX('""',CAST(C AS NVARCHAR(50)),2)),'ZZZZZZZ') AS C
,groupId = DENSE_RANK() OVER (ORDER BY C, _groupId)
FROM
(
SELECT
N
,SUBSTRING(@format_string COLLATE Latin1_General_CS_AS,N,1) AS C
,_groupId = N - ROW_NUMBER() OVER (PARTITION BY SUBSTRING(@format_string COLLATE Latin1_General_CS_AS,N,1) ORDER BY N)
FROM
cteTally
WHERE
N <= LEN(@format_string)
) AS fs)
SELECT
(SELECT
CASE REPLICATE(MIN(C),COUNT(*))
WHEN 'YYYY' THEN RIGHT('0000' + CAST(YEAR(@date) AS NVARCHAR(4)),4)
WHEN 'YY' THEN RIGHT('00' + CAST(YEAR(@date) AS NVARCHAR(4)),2)
WHEN 'Y' THEN CAST(CAST(RIGHT('00' + CAST(YEAR(@date) AS NVARCHAR(4)),1) AS INT) AS NVARCHAR(2))
WHEN 'MMMM' THEN DATENAME(month,@date)
WHEN 'MMM' THEN LEFT(DATENAME(month,@date),3)
WHEN 'MM' THEN RIGHT('00' + CAST(MONTH(@date) AS NVARCHAR(2)),2)
WHEN 'M' THEN CAST(MONTH(@date) AS NVARCHAR(2))
WHEN 'DDDD' THEN DATENAME(weekday,@date)
WHEN 'DD' THEN RIGHT('00' + CAST(DAY(@date) AS NVARCHAR(2)),2)
WHEN 'D' THEN CAST(DAY(@date) AS NVARCHAR(2))
WHEN 'HH' THEN RIGHT('00' + CAST(DATEPART(hour,@date) AS NVARCHAR(2)),2)
WHEN 'H' THEN CAST(DATEPART(hour,@date) AS NVARCHAR(2))
WHEN 'hh' THEN RIGHT('00' + CAST(
CASE DATEPART(hour,@date)
WHEN 12 THEN 12
ELSE DATEPART(hour,@date) % 12
END AS NVARCHAR(2)),2)
WHEN 'h' THEN
CASE WHEN LEFT(
RIGHT('00' + CAST(
CASE DATEPART(hour,@date)
WHEN 12 THEN 12
ELSE DATEPART(hour,@date) % 12
END AS NVARCHAR(2)),2),1) = 0 THEN
RIGHT('00' + CAST(
CASE DATEPART(hour,@date)
WHEN 12 THEN 12
ELSE DATEPART(hour,@date) % 12
END AS NVARCHAR(2)),1)
ELSE
RIGHT('00' + CAST(
CASE DATEPART(hour,@date)
WHEN 12 THEN 12
ELSE DATEPART(hour,@date) % 12
END AS NVARCHAR(2)),2)
END

WHEN 'mm' THEN RIGHT('00' + CAST(DATEPART(minute,@date) AS NVARCHAR(2)),2)
WHEN 'm' THEN CAST(DATEPART(minute,@date) AS NVARCHAR(2))
WHEN 'ss' THEN RIGHT('00' + CAST(DATEPART(second,@date) AS NVARCHAR(2)),2)
WHEN 's' THEN CAST(DATEPART(second,@date) AS NVARCHAR(2))
WHEN 'fff' THEN RIGHT('000' + CAST(DATEPART(millisecond,@date) AS NVARCHAR(3)),3)
WHEN 'f' THEN CAST(DATEPART(millisecond,@date) AS NVARCHAR(3))
WHEN 'tt' THEN
CASE
WHEN DATEPART(hour,@date) >= 12 THEN N'PM'
ELSE N'AM'
END
WHEN 't' THEN
CASE
WHEN DATEPART(hour,@date) >= 12 THEN N'P'
ELSE N'A'
END
WHEN 'x' THEN
CASE
WHEN CAST(DAY(@date) AS INT) IN (1,21,31) THEN N'st'
WHEN CAST(DAY(@date) AS INT) IN (3,23) THEN N'rd'
ELSE N'th'
END
ELSE
MIN(C)
END
FROM
tokenizedString
GROUP BY
groupId
ORDER BY
MIN(N)

FOR
XML PATH('')
,TYPE
).value('(./text())[1]','nvarchar(50)')

AS FormattedDate
)



The Wizard Of Oz
The Wizard Of Oz
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This is a really simple and effective script!

One question I had is how would the function know the difference between 'Mon' and 'MON' if the DB collation is case-insensitive?

When I ran the following code on my case-insensitive DB it still gave me a 6...
SELECT CHARINDEX('Mon','YYYY-MON-D')


zulmanclock
zulmanclock
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In its current format it does not recognize the difference. If you chance the line

      IF (CHARINDEX ('MON',@DateValue)>0)
SET @DateValue = REPLACE(@DateValue, 'MON',
LEFT(UPPER(DATENAME(MM, @Datetime)),3))

with

   IF (CHARINDEX ('MON',@DateValue COLLATE LATIN1_GENERAL_CS_AS)>0)
SET @DateValue = REPLACE(@DateValue, 'MON',
LEFT(UPPER(DATENAME(MM, @Datetime)),3))



That will force the function to distinguish between the upper case and the lower case. Tested and works on my database.

Thank you for your comment and question.
vishnus
vishnus
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There is a bug in DateFormat function

E.g.: SELECT dbo.fnDateFormat('5/5/2013','MON')
O/P: 5AY
zulmanclock
zulmanclock
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vishnus (4/18/2013)
There is a bug in DateFormat function

E.g.: SELECT dbo.fnDateFormat('5/5/2013','MON')
O/P: 5AY


Please make sure you have the revised function code, there was a bug found and i adjusted the code. See below:

SET @DateValue = @Format

IF (CHARINDEX ('YYYY',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue, 'YYYY',
DATENAME(YY, @Datetime))
IF (CHARINDEX ('YY',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue, 'YY',
RIGHT(DATENAME(YY, @Datetime),2))
IF (CHARINDEX ('Month',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue, 'Month',
DATENAME(MM, @Datetime))
IF (CHARINDEX ('MON',@DateValue COLLATE LATIN1_GENERAL_CS_AS)>0)
SET @DateValue = REPLACE(@DateValue, 'MON',
LEFT(UPPER(DATENAME(MM, @Datetime)),3))
IF (CHARINDEX ('Mon',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue, 'Mon',
LEFT(DATENAME(MM, @Datetime),3))
IF (CHARINDEX ('MM',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue,'MM',
RIGHT('0'+CONVERT(VARCHAR,DATEPART(MM, @Datetime)),2))
IF (CHARINDEX ('M',@DateValue) > 0) AND (CHARINDEX('MA',@DateValue)=0)
SET @DateValue = REPLACE(@DateValue,'M',

CONVERT(VARCHAR,DATEPART(MM, @Datetime)))
IF (CHARINDEX ('DD',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue, 'DD',
RIGHT('0'+DATENAME(DD, @Datetime),2))
IF (CHARINDEX ('D',@DateValue) > 0)
SET @DateValue = REPLACE(@DateValue,'D',
DATENAME(DD, @Datetime))
RETURN @DateValue
END



Make sure that your code has the highlighted row in it, if not just copy and paste this code into your function and it should be fine.

Thank you
Go


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