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change date format

Posted on 2014-01-08
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Last Modified: 2014-01-09
I need to change the date format of a char(10) field to char(10) style 110. What is the most efficient way. This is sql 2005. Since the dates are consistent I suppose that I could use substring but is there a better way?

ex.05122008  change to  05-12-2008
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Question by:qube09
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Accepted Solution

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Guy Hengel [angelIII / a3] earned 500 total points
ID: 39766496
you would normally need a double conversion ... first from string to date, and then back.
http://www.experts-exchange.com/Database/Miscellaneous/A_1499-DATE-and-TIME-don%27t-be-scared-and-do-it-right-the-first-time.html

the issue is that the format ddmmyyyy is not a "known" style for the simple convert...
so, you have to first "rework" a bi the input string for this.

hence, you could as well "skip" the double conversion, and just do string operations:
update yourtable
  set yourfield = left(yourfield,2) + '-' + substring(yourfield, 3,2) + '-' + right(yourfield,4)
where yourfield like '[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]'

Open in new window


hope this helps
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Expert Comment

by:Scott Pletcher
ID: 39766535
UPDATE dbo.tablename
SET date_column = STUFF(STUFF(date_column, 3, 0, '-'), 6, 0, '-')


For example:

SELECT date_column, STUFF(STUFF(date_column, 3, 0, '-'), 6, 0, '-')
FROM (
    SELECT '05122008' AS date_column
) AS test_data


Btw, odd format, since of course it won't sort correctly like that.
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LVL 92

Expert Comment

by:Patrick Matthews
ID: 39767848
Why are you using char to store a date?

:)
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