am Wed, dem 14.02.2007, um 2:01:09 -0600 mailte Ron Johnson folgendes: > >> 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. I know, but to do this do you need to know the first day in this week... Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG-ID: 0x3FFF606C, privat 0x7F4584DA http://wwwkeys.de.pgp.net
