But that ISO standard has no definition of what defines weeks per month.

A week is clearly defined but not how it relates to the entity of the month. I think it's safe to assume that the OP meant it to be the number of weeks that either fall completely within the month and those that are transected by the beginning and end of the month.

In reply to Re^3: No: of weeks in a month by grumbert
in thread No: of weeks in a month by Anonymous Monk

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