Add days to a date
The calculator adds the chosen number of days to a start date — a negative number subtracts — and reports the resulting date, its weekday and its ISO week, taking the uneven lengths of months and leap years into account so you need no calendar.
- Day of week
- Sunday
- Week number
- 40
What date falls 30 or 90 days from now?
Add the days to the start date and let the calendar cross the month boundaries. From 1 March 2026, for instance, 30 days later is 31 March and 90 days later is 30 May, because March has 31 days, April 30 and May 31. Leap years are handled for you.
What is the difference between calendar days and working days?
A calendar count does not jump over weekends: 10 days from a Friday is the next Monday, while 10 working days from a Friday is the Friday a fortnight later. When a deadline lands on a rest day or public holiday, many procedural rules move it to the next working day — the calendar arithmetic does not.