Calendar days calculator
Calendar days count every day, weekends and holidays included. Business days count only weekdays. A contract saying "within 30 days" means calendar days unless it says otherwise — and the gap is large: thirty working days is exactly six weeks, or 42 calendar days, so getting the kind of day wrong costs nearly a fortnight.
How to count calendar days
Legal and contractual deadlines default to calendar days in most jurisdictions, and the exceptions are specific: court filing deadlines, statutory notice periods and some payment terms are often defined in working days. Where a document says only "days", calendar days is the safe reading, and where you are drafting one, saying which kind removes an argument that otherwise surfaces at the worst moment. Two further conventions catch people out. Some procedural rules count "clear days", excluding both the day the period starts and the day it ends, so three clear days from a Monday expires on the Friday rather than the Thursday. And most rules that set a calendar-day deadline also say that a deadline landing on a weekend or public holiday rolls to the next working day, so a calendar-day count can be right and still not be the date anything is actually due.
Questions
Any day at all, including weekends and public holidays.
Usually not. Unless a document says working or business days, calendar days is the normal reading.
Thirty working days is 42 calendar days; six weeks exactly. That is the whole reason the distinction is worth writing down.
A count that excludes both the first day and the last. Three clear days from a Monday runs Tuesday to Thursday and expires on the Friday.
Most rules roll it forward to the next working day, but that is a rule about the deadline, not about the count. This tool gives you the count.
As calendar days, yes. As business days, no, deduct them separately.
It depends on the convention. Switch inclusive counting on if it should: it adds exactly one day to the total.