As an example, 2021 has the same pattern (October 1st is friday): http://www.timeanddate.com/calendar/monthly.html?year=2021&month=10 http://www.timeanddate.com

As an example, 2021 has the same pattern (October 1st is friday): http://www.timeanddate.com/calendar/monthly.html?year=2021&month=10 http://www.timeanddate.com/calendar/monthly.html?year=2021&#...