Hello,

Today, 10th of July according to my Outlook calendar seems to be week 28 
but the "%W" format in Weewx shows week 27. In general this year this 
format shows one more week than Excel/Outlook/etc.

Somebody knows why? Shouldn't follow ISO8610?
https://en.wikipedia.org/wiki/ISO_8601

In this thread (
https://groups.google.com/forum/#!msg/weewx-user/funRVI-T_p0/e58oZtK6AwAJ) 
says that week number follow the following rule:

%W Week number of the year (Monday as the first day of the week) as a 
decimal number [00,53]. All days in a new year preceding the first Monday 
are considered to be in week 0.

and this is not the same as ISO8610. Why? How can I get the same week 
number as ISO8610? The rule that ISO follows is:

There are several mutually equivalent and compatible descriptions of week 
01:


   - the week with the year's first Thursday in it (the formal ISO 
      definition),
      - the week with 4 January in it,
      - the first week with the majority (four or more) of its days in the 
      starting year, and
      - the week starting with the Monday in the period 29 December – 4 
      January.
   
Acording to this today, 10th of July of 2019 is W28.

Thanks,
Ferran

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