Re: converting a specified year and week into a date

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On 02/14/07 01:36, A. Kretschmer wrote:
> 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.

I think she wants to do the opposite: cast 2004w1 to YYYY-MM-DD format.

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