Days Between Dates Calculator
Calculate the exact duration between two dates, add or subtract days, and plan your schedule efficiently.
Date Duration
0 days
Add/Subtract Days
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Tool Features
- Exact Duration: Calculates years, months, weeks, and days precision.
- Bidirectional Calculation: Add or subtract days to find past or future dates.
- Leap Year Support: Automatically handles leap years (e.g., 29 days in Feb).
- Time Difference: Shows total hours, minutes for precise planning.
- Privacy Focused: All calculations happen in your browser. No data sent to server.
How It Works
Our date calculator uses the standard Gregorian calendar to compute time intervals. Here's the logic used for different calculations:
Duration: The absolute difference in milliseconds between two timestamps is calculated and converted into days (1 day = 86,400,000 ms).
Adding Days: The specific number of days is added to the date object, and the calendar automatically adjusts for month lengths and year changes.
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Frequently Asked Questions
How do I calculate days between two dates?
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Simply enter the Start Date and End Date in the inputs above and click "Calculate Duration". The tool
will show you the total days, as well as the breakdown in years, months, and weeks.
does this calculator include the end date?
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By default, the calculation represents the duration between the dates. For example, from Jan 1
to Jan 2 is 1 day. If you want to include both the start and end days (inclusive count), simply add 1 to
the result.
How are leap years handled?
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Yes, our calculator fully supports leap years. If your date range includes February 29th of a leap year
(like 2024 or 2028), it will be counted as an extra day automatically.
Can I subtract days from a date?
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Absolutely. In the "Add/Subtract Days" section, you can enter a negative number (e.g., -30) to find what
the date was 30 days ago.
Is this tool free to use for commercial projects?
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Yes, JSON Formatters Pro tools are 100% free for both personal and commercial use. The calculations are
performed locally in your browser, ensuring privacy.