Add or subtract days from a date calculator
Add or subtract days, months and years from a date to find the resulting date.
Months and years respect the calendar (e.g. Jan 31 + 1 month lands at end of February).
How the calculation works
This calculator finds a future or past date by adding or subtracting years, months and days from a start date. It applies years first, then months, then days, respecting each month's length and leap years.
Step-by-step example
From 15/01/2026, adding 3 months and 10 days: lands on 25/04/2026.
What it's for
Finding a deadline ("90 days from today"), an event date, the end of a warranty or a probation period. To count business days only, use the business-days calculator.
Examples
- Today + 90 days: a three-month deadline.
- 01/03/2026 − 45 days = 15/01/2026.
Frequently asked questions
What day is 90 days from now?
Leave the start date as today, choose "Add" and enter 90 in days.
Does adding "1 month" always mean 30 days?
No — it respects the calendar. Jan 31 + 1 month lands on Feb 28 (or 29 in a leap year).
Can it count business days only?
This adds calendar days. For business-day deadlines, use the business-days calculator.
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Updated on June 18, 2026 · by Rafael Rossi · Methodology & sources