Informix SQL Calculate WeekNumber

How can I calculate a weeknumber in Informix?

I just need a quick and easy solution that can be easily included in a SQL Select Statement. The 53rd week is not a problem for my intended usage.
Ryan SimmonsBusiness Analyst IIIAsked:
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Hi Ryan.

Here's a function that I like (and that is referenced in an IBM tech article):

CREATE FUNCTION week_of_year(dt date)
RETURNS integer

DEFINE day1 date;
DEFINE nbdays int;

LET day1 = MDY(1, 1, YEAR(dt));
LET nbdays = dt - day1;

RETURN 1 + (nbdays + WEEKDAY(day1)) / 7;


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The "Date Processing in Informix" article that it is part of should be available here:

Take note of the caveats and additional information that is available after the function definition--there's some important (and good) stuff in there.

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