Thanks for everybody - I will test your solution ... it seems correctly ...

W dniu 2011-04-08 02:53, midrange-l-request@xxxxxxxxxxxx pisze:
message: 4 date: Thu, 7 Apr 2011 16:26:03 -0700 from: Albert York <alfromme@xxxxxxxxx> subject: Re: Calculate diffrence between dates - weeks - but not so simple ... Is this what you want? The starting date is always week 1, regardless of the day of week. Any date on or after rthe following Saturday and on or before the Friday after that is week 2 And so on for week 3, week 4, etc until you reach the ending date. Albert 2011/4/7 Tomasz Skor?a <t.skorza@xxxxxxxxxxx>:
> Hi
> I need to create an algorithm which allow me to calculate diffrence between two dates but assumption
> is that first day of week is SATURDAY, and week going from saturday to friday.
> So if first date is 2011-03-28 - monday, then for second date from 2011-03-29 to 2011-04-01
> algorithm should return 1 (week), but for 2011-04-02 - saturday algorithm should return 2 (weeks).
> Have you any idea?
> I tried many posssibilities and something is wrong, depend on start and stop dates sometimes result
> is as I expect sometimes not ...
> Regards
> Tomek
> --

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