Number weeks between two dates which are in same year or different year

Hi,
how to calculate the number of weeks between two dates?
eg. '17-mar-2013' and '27-jun-2013' or '15-jun-2013' and '25-mar-2014'
Thanks in advance.
lukx

A not tested "integer arithmetic" example (to be adjusted to your conceptions if feasible) covering only both dates in the same year and dates in successive years examples.
consider Setting Up a Globalization Support Environment
select case when substr(:start_date,1,4) = substr(:end_date,1,4)
            then to_number(to_char(to_date(:end_date,'yyyymmdd'),'iw')) -
                 to_number(to_char(to_date(:start_date,'yyyymmdd'),'iw'))
            when to_number(substr(:end_date,1,4)) - to_number(substr(:start_date,1,4)) = 1
            then to_number(to_char(trunc(to_date(:end_date,'yyyymmdd'),'yyyy') - 1,'iw')) -
                 to_number(to_char(to_date(:start_date,'yyyymmdd'),'iw')) +
                 to_number(to_char(to_date(:end_date,'yyyymmdd'),'iw')) + 1
       end iso_weeks_between
from dual
Regards
Etbin
the following seems to work for iso weeks treated as buckets
with
t as
(select date '2013-03-17' d1,date '2013-06-17' d2 from dual union all
select date '2003-12-31',date '2004-01-01' from dual union all
select date '2004-12-31',date '2005-01-01' from dual union all
select date '2005-12-31',date '2006-01-01' from dual union all
select date '2013-12-29',date '2013-12-30' from dual union all
select date '2016-01-03',date '2016-01-04' from dual union all
select date '2013-06-15',date '2014-03-25' from dual
select d1,
       to_number(to_char(d1,'iw')) low_iso_week,
       d2,
       to_number(to_char(d2,'iw')) high_iso_week,
       to_number(to_char(d2,'iw')) - to_number(to_char(d1,'iw')) iso_week_diff,
       case when to_number(to_char(d2,'iw')) - to_number(to_char(d1,'iw')) < 0
            then to_number(to_char(d2,'iw')) - to_number(to_char(d1,'iw')) +
                 case when to_char(trunc(d2,'yyyy'),'iw') = '01'
                      then 52
                      else to_number(to_char(trunc(d2,'yyyy'),'iw'))
                 end
            else to_number(to_char(d2,'iw')) - to_number(to_char(d1,'iw'))
       end iso_weeks_apart
from t
Message was edited by: Etbin
with no Database at hand pencil and paper is too error prone to figure out iso week changes for varioud december - january periods

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Always say which version of Oracle you're using (e.g., 11.2.0.2.0).
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michielvoo wrote:
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