Adding a number of days to a date is the operation most often got wrong by hand, because month ends — and February in particular — break the pattern mental arithmetic relies on. Enter a start date and a number of days and this returns the resulting date and its weekday.
The convention is that day one is the day after the start, not the start itself, so fourteen days from 1 March lands on 15 March. If the document you are working from counts the first day as day one, take one off the result. Periods in the UAE are written both in calendar days and in working days, and the two diverge sharply near the Eid blocks: four consecutive statutory days plus the weekend can put six or seven calendar days between two consecutive working days. Where a period is stated in working days, use the working-days tool rather than this one.
Leap years are handled automatically — 60 days from 1 January reaches 2 March in a common year and 1 March in a leap year. Negative numbers run the same operation backwards, and where the number of days divides evenly the equivalent in weeks is shown alongside.
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