This date calculator adds or subtracts any number of years, months, weeks and days from a start date and shows the resulting date with its day of the week. It answers questions like “what date is 90 days from today?”, “when is 6 weeks before my exam?” or “when does a 30-day return window end?”.
You can also count in business days, which skips Saturdays and Sundays, for payment terms, shipping estimates and legal deadlines. Quick buttons cover the most common periods, and the calculation is shown in words so you can check it.
How to use the Date Calculator tool
- Pick the start date (today by default).
- Choose Add or Subtract.
- Enter the number of years, months, weeks and/or days, or tap a quick button such as 30 or 90 days.
- Tick business days if weekends should be skipped.
- Read the result date, its weekday and how many calendar days away it is.
Why use ToolOrca Date Calculator
- Add or subtract years, months, weeks and days
- Business day mode that skips weekends
- Quick buttons for 30, 60, 90 days, 6 weeks, 6 months, 1 year
- Shows the weekday of the result
- Correct month-end handling (31 Jan + 1 month)
- Works for dates in the past or future
How dates are added
Years and months are added first, then weeks and days. When the same day does not exist in the target month, the last day of that month is used: 31 January 2026 plus 1 month is 28 February 2026. Days and weeks are then added one calendar day at a time, so month lengths and leap years are always correct.
Worked example: 13 November 2026 plus 90 days is Thursday, 11 February 2027. 13 November 2026 minus 90 days is Saturday, 15 August 2026. And 10 business days after Friday, 13 November 2026 is Friday, 27 November 2026, because the two weekends in between are skipped.
Frequently asked questions
What date is 30 days from today?
Leave the start date as today and enter 30 days. For example, 30 days after 13 November 2026 is Sunday, 13 December 2026.
What date is 90 days from 13 November 2026?
It is Thursday, 11 February 2027. Ninety days is often used for visa stays, probation periods and payment terms.
Is adding 1 month the same as adding 30 days?
No. Adding 1 month moves to the same day number in the next month, so it can be 28 to 31 days. From 1 February 2026, 1 month is 1 March (28 days later) while 30 days is 3 March.
How are business days counted?
In business day mode, each Saturday and Sunday is skipped, so 5 business days after a Monday is the following Monday. Public holidays are not skipped, because they differ by country.