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Part II: Function to convert date from text format YYYYDDD where DDD = day of year

Posted on 2007-11-20
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Last Modified: 2011-09-20
eg. select dbo.CnvDateYYYYDDD('2007032')  will return 1-Feb-2007 as a date

Can you pls update the following so that DateTime format is returned? http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/Q_22973663.html

Thanks!
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Question by:xenium
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8 Comments
 

Author Comment

by:xenium
ID: 20324234
i think its just this:

alter FUNCTION dbo.CnvDateYYYYDDD(
    @yyyyddd varchar(7)
)
RETURNS datetime
AS
BEGIN
RETURN     DATEADD(DAY, CAST(RIGHT(@yyyyddd, 3) AS INT) - 1, LEFT(@yyyyddd, 4) + '0101')
   
END
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Author Comment

by:xenium
ID: 20324462
Since efficiency was a theme, might there be a faster way to code this if the input were an integer ?
eg select dbo.CnvDateYYYYDDD(2007032)

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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 20326365
your code is fine, choosing integer as data type will only add more implicit cases for the left and right functions...
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Author Comment

by:xenium
ID: 20326534
I'm thinking with integer we coudl avoid string operations completely, eg year = yyyyddd/1000, day = yyyyddd - 1000*year

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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 125 total points
ID: 20326546
a good point, actually.

consider the modulo operator
day = yyyyddd % 1000  

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Author Comment

by:xenium
ID: 20326600
Ok thanks. Here then is the integer version of the function:


alter FUNCTION dbo.CnvDateYYYYDDD(
    @yyyyddd int
)
RETURNS datetime
AS
BEGIN
RETURN     DATEADD(DAY, @yyyyddd % 1000 - 1, DATEADD(YEAR,@yyyyddd/1000 -1900,0))
END

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Author Comment

by:xenium
ID: 20326610
I'm leaving this open a bit, coz i may just do a benchmark test vs the string functions, and note the results here for the record.
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Author Comment

by:xenium
ID: 22330100
no time for benchmark, sorry.
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