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T-SQL Date to Julian Conversion

Posted on 2003-11-25
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Last Modified: 2009-01-27
Using T-SQL how can a date field (mm/dd/yyyy) be converted to a Julian Day Number?
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Question by:jlindeman
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snimmaga earned 256 total points
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by:lausz
lausz earned 248 total points
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by:Scott Pletcher
Scott Pletcher earned 248 total points
ID: 9820067
Try this:

DECLARE @date SMALLDATETIME
DECLARE @julDate INT
SET @date = '2003-11-25'

SET @julDate = YEAR(@date) * 1000 +
      DATEDIFF(DAY, CAST(YEAR(@date) AS CHAR(4)) + '-01-01', @date) + 1

SELECT @julDate


Didn't know if you wanted if YYDDD or YYYYDDD, so used YYYY.
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by:Lowfatspread
Lowfatspread earned 248 total points
ID: 9820590
Hi jlindeman,

Declare @jd int
set @Jd = Year(@date) * 1000 + Datepart(dy,@date)



Cheers!
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