Re: converting a specified year and week into a date

am Tue, dem 13.02.2007, um 13:56:15 -0800 mailte vanessa folgendes:
>
> hi guys,
> i was just wondering if it was at all possible to turn a year and a given
> week number into a real date just using postgresql commands?
>
>
> e.g. if i have year = 2004 and week = 1,
> can i turn that into say 2004-01-01 (so that the specified
> date is the one for the beginning of week 1 in the year 2004

You can extract the week from a given date with this:

SELECT EXTRACT(WEEK FROM '2006-01-01'::date);

Be careful, the 1.1. can be in the 52. week in the last year. If you
know the first day in the year in week 1, then you can add 7* the given
week-1 days to this date.

Andreas
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Andreas Kretschmer
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