According to the ISO standard for week numbering, the first yearly calendar week starts on the first thursday in January.
Therefore 2016 week #1 should start on January 4th.
In my dashboards, i use a date field formatted as week numbers and there the week #1 for 2016 is starting at January the first:
As far as i know this isn't something configurable, but its confusing my users that the tableau week number is +1 to all other week numberings (e.g. Outlook)
Bug or feature?