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Add days to a date

Find the date that is a number of days, weeks, months or business days after or before another date.

Free and private. Everything runs in your browser, nothing is uploaded.

How it works

  1. Enter the datesThe right mode is already selected.
  2. Adjust the optionsInclude the end date or switch the unit as needed.
  3. Read the resultThe answer appears at once.

Deadlines and due dates

Payment terms of 30 days, a 90 day return window, a 6 month probation period or 14 business days for delivery: enter the start date and the period, and the calculator gives the exact date with the weekday. Choose Subtract to find when something had to start, for example 280 days before a due date.

Business days skip Saturdays and Sundays. Public holidays differ by country, so add a day for each holiday that falls in the period.

Months are special

Adding months keeps the same day of the month where possible. If that day does not exist, the last day of the month is used, so 31 March plus one month is 30 April.

Frequently asked questions

What date is 90 days from today?

Enter today's date and 90 days. The result shows the date and weekday.

Is the end date included?

Not by default. Turn on Include end date to count both the start and the end day.

Are public holidays excluded from business days?

No. Only Saturdays and Sundays are excluded, since holidays differ by country.

What is 31 January plus one month?

The last day of February, 28 or 29 depending on the year.

Can I go back in time?

Yes. Choose Subtract, or enter an end date before the start date.