Free Date Calculator - Add & Subtract Time

Select today's date in the Start Date field, choose "Add", enter 90 in the Days field (leave Years and Months at 0), then click Calculate Date. The result instantly shows you the exact calendar date 90 days from your start date. This is commonly used to calculate delivery deadlines, contract expiry dates, payment due dates, and probation end dates.

Yes, automatically. When you add months or years to a date, the calculator correctly handles February 29th in leap years. For example, adding one year to February 29, 2024 will give you February 28, 2025 — because 2025 is not a leap year and February only has 28 days. All edge cases involving varying month lengths are handled correctly without any manual adjustment.

Yes. Select your start date, choose "Subtract", and enter the years, months, and days you want to subtract — or alternatively, think of it as finding what date falls a certain interval before your chosen date. For a direct days-between-dates calculation, subtract the earlier date from the later one using the Years/Months/Days fields to find the exact interval in calendar units.

Extensively. Common business uses include calculating contract notice periods (e.g. 30 or 90 days), project milestone deadlines, invoice payment due dates (Net 30, Net 60), subscription renewal dates, employee probation end dates, warranty expiry dates, and regulatory compliance filing deadlines. Legal professionals use it for statute of limitations calculations and court-ordered date arithmetic.

Yes. You can enter any combination of years, months, and days simultaneously and the calculator applies them all in a single operation. For example, subtracting 2 years, 3 months, and 15 days from a date gives you the precise result accounting for all calendar rules. This is useful for calculating historical dates, backdating documents, or finding dates relative to past events.