Date Plus / Minus Calculator.
Find the exact future or past date by adding or subtracting days, weeks, months, or working business days from any date.
30 days after start date is:
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How to Add or Subtract Days from Any Date
Adding or subtracting a specific duration from a calendar date is one of the most frequent date math tasks in international travel, project management, real estate, and legal compliance. Whether you need to know "what date is 90 days from today" for a visa limitation or "what date was 30 days ago" for a billing invoice, our calculator computes the exact target date instantaneously.
Common Real-World Use Cases
- Visa & Travel Restrictions: The European Schengen 90/180-day rule requires calculating exactly when your 90-day tourist allowance expires.
- Legal & Statutory Deadlines: Legal summons, contract cooling-off periods, and FOIA requests are often measured in 14, 30, or 60 calendar days.
- Pregnancy Due Dates: Adding 280 days (40 weeks) from the first day of the last menstrual period is the standard medical calculation for estimated due dates (EDD).
- Product Warranties & Return Windows: Tracking the exact expiration date for 30-day, 60-day, or 1-year product guarantees.
- Finance & Interest Accrual: Calculating promissory note maturities (such as 30, 60, 90, or 180-day term deposits).
Calendar Days vs. Business Days Calculation
When calculating working schedules, checking "Count business days only" skips Saturdays and Sundays. For example, adding 10 business days to a Monday results in the second following Monday (14 calendar days total), accounting for the two intervening weekends.
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Frequently Asked Questions
What date is 90 days from today? ▼
Click the "+90 Days" quick preset above to instantly see the exact date, weekday, and week number 90 days into the future starting from today.
How does leap year affect adding a full year (365 days)? ▼
A standard calendar year has 365 days, whereas leap years contain 366 days (including February 29th). If your interval crosses a leap day, adding 365 calendar days will fall on the day before the same date next year, while adding "1 Year" lands on the identical calendar date.
Can I add working business days only? ▼
Yes. Toggle the "Count business days only" checkbox. The calculator will advance day-by-day and exclude all Saturdays and Sundays automatically.