Adding a number of days to a date sounds trivial and mostly is, but it is the operation people most often get wrong by hand — month ends, and February in particular, break the pattern that mental arithmetic relies on. Enter a start date and a number of days and this returns the resulting date and the weekday it falls on.
The important detail is that day one is the day after the start, not the start itself. A deadline described as "within 14 days of 1 March" lands on 15 March here. If the document you are working from counts the first day as day one, subtract one from the result. Legal and administrative periods in the UK are written both ways, and phrases such as clear days or working days each mean something different again — a period stated in working days needs the working-days tool, since it must step over weekends and over whichever bank holidays apply in the relevant nation.
Leap years are handled automatically: 60 days from 1 January reaches 2 March in a common year and 1 March in a leap year. The calculator also accepts negative numbers, which simply runs the same operation backwards, and reports the total in weeks where the number divides evenly, since a great many periods are set in weeks and quoted in days.
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