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Analytics: aggregation from to month


Hi all,

As of 2.27 the aggregation from weeks to months in analytics was changed:
weeks are attributed to the month where they have four days or more. But we
are experiencing some unexpected behavior in 2.28. As an example here I
paste a row extracted from _periodstructure table in demo server:

(We have checked that period type is set to ISO8601, so Monday is the first
day in the week)

890450 2017W13 7 2017-03-28 2017-04-03 null 2017W13 null null null null
201704 201702B 2017Q2 2017S1 2017AprilS1 2017 2017April 2016July 2016Oct
Here there are two things:

- 2017W13 is actually from 2017-03-27 to 2017-04-02 in ISO8601.
- This week is attributed to April, which would be wrong even if the week
were from 2017-03-28 to 2017-04-03.

Is it the expected behavior? Maybe am I missing some configuration

Thanks in advance,