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Add Days to Date Calculator
What's the date 90 days from now? Do the arithmetic.
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How to Use This Tool
- Pick a start date.
- Choose add or subtract, enter the amount and pick the unit.
- The result date, weekday and the span in days appear instantly.
Frequently Asked Questions
What happens on a month-end date?
Adding one month to January 31 clamps to the last valid day (February 28 or 29), so you never land on an invalid date.
Does it handle leap years?
Yes — adding a year to February 29, 2024 lands on February 28, 2025, the correct calendar result.
How many days are in a "month"?
Month and year arithmetic is calendar-based, not fixed-length. For fixed 30-day spans, use days or weeks instead.
What's 90 days from today?
Set today as the start and add 90 days — the tool shows the exact date and weekday.
Practical Example
A warranty expires 60 days from purchase:
- Set start date to the purchase date.
- Choose Add, amount 60, unit days.
- The tool returns the exact expiry date and its weekday.
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