Date Calculator
Add or subtract days, weeks, months or years from a date.
Result
–
Days from today
| From today | Date | Days ago |
|---|---|---|
| 7 days | – | – |
| 14 days | – | – |
| 30 days | – | – |
| 45 days | – | – |
| 60 days | – | – |
| 90 days | – | – |
| 100 days | – | – |
| 120 days | – | – |
| 180 days | – | – |
| 365 days | – | – |
How the date calculator works
Years and months are added first, then weeks and days. Months are calendar months, so adding 1 month to March 15 gives April 15, whatever the number of days in March. When the day does not exist in the target month, the last day of that month is used.
Example: January 15, 2026 plus 90 days is Wednesday, April 15, 2026. The result also shows the ISO week number, handy when you plan in weeks.
Need the number of days between two dates instead? Use the days between dates calculator. For deadlines in business days, use the working days calculator.
Frequently asked questions
What date is 90 days from today? +
The table "Days from today" on this page shows it, together with 30, 60, 100, 120 and 180 days. It updates every day. Ninety days is often used for return policies, probation periods and visa stays.
Is the start date counted? +
No. Adding 1 day to a date gives the next day. January 15 plus 90 days is Wednesday, April 15. If your rule says "within 90 days including today", subtract one day from the result.
What happens when I add a month to January 31? +
There is no February 31, so the calculator uses the last day of the month: January 31, 2026 plus 1 month is February 28. This is the same rule spreadsheets like Excel (EDATE) use.
Can I add business days instead of calendar days? +
Yes, with the working days calculator: its "Add or subtract business days" tool skips weekends and public holidays of the US, UK, Canada or Australia.