Add or Subtract Days from a Date
Find the date a number of days, weeks, months or business days before or after any date — for deadlines, notice periods and due dates.
How to use
- 1Pick a start date and enter the amounts to add (use negative numbers to go back).
- 2Choose calendar or business days and read the resulting date.
How it's calculated
Months are added first (clamping to the month's last day, so 31 January + 1 month = 28/29 February), then weeks and days. Business days skip Saturdays and Sundays.
Frequently asked questions
How do I count back from a date?
Enter negative numbers, e.g. -30 days to find the date 30 days before.
What is 90 days from today?
Leave the start date empty (today), enter 90 days and read the result. It's about three months, but not exactly because month lengths vary.
Do business days include holidays?
Weekends are skipped but public holidays aren't, since they vary by country. Add a day for each holiday in the period.