Observed Holidays/Office Closed - Reflected in timelines and due dates

It would be great if we could note which holidays are observed by our company so that no assignments would be allowed to be due that day by mistake. It would also be great for creating timelines so that the holidays observed aren’t counted in the amount of days it takes for each step/task to get completed and so we dont forget to not count it in as a day of work. This would act similarly to not counting the weekends, it should be a fairly simple code addition since something similar already exists.

Yes this would absolute be helpful for us as well. We have a hard deadline of 14 business days for completing a legal process and we have set a formula considering weekdays only but we need the ability to have holidays considered in this formula as the office is closed and it affects the deadline.