Most concise way to convert from date format: yyyy[3 digit day of year] to SQL datetime

Posted by Seth Reno on Stack Overflow See other posts from Stack Overflow or by Seth Reno
Published on 2010-04-22T15:52:41Z Indexed on 2010/04/22 16:03 UTC
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sql

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datetime

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dates

I'm working with an existing database where all dates are stored as integers in the following format: yyyy[3 digit day of year].

For example:

2010-01-01 == 2010001
2010-12-31 == 2010356

I'm using the following SQL to convert to a datetime:

DATEADD(d, 
    CAST(SUBSTRING(
            CAST(NEW_BIZ_OBS_DATE AS VARCHAR), 5, LEN(NEW_BIZ_OBS_DATE) - 4
        ) AS INT) - 1, 
    CAST('1/1/' + SUBSTRING(CAST(NEW_BIZ_OBS_DATE AS VARCHAR),1,4) AS DATETIME))

Does anyone have a more concise way to do this?

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