Calculation of last 180 days is incorrect.

Calculator is considering last 181 days (includes current date) instead of 180. https://ec.europa.eu/assets/home/visa-calculator/calculator.htm?lang=fr considers last 180 days instead.

For example check with dates:
First entrance: `09/19/2016 — 11/06/2016`
Second entrance: `02/05/2017 — 05/05/2017`

Start by locating the JavaScript entry point for the Schengen visa calculator and the calculation logic that handles the rolling date range. Reproduce the issue with the two entrance ranges in the report and compare the result with a 180-day window that excludes the current date. Done means the example and related boundary cases calculate the same 180-day period as the referenced calculator.

Escrita pelo modelo de indexação a partir do texto da issue.