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Date Difference Calculator

Find the number of days, weeks, or months between two dates

100% client-side — your data never leaves your browser

Como usar Calculadora de Diferença de Datas

  1. 1

    Enter the start date

    Select or type the first date using the date picker.

  2. 2

    Enter the end date

    Select or type the second date. The order does not matter — the tool shows the absolute difference.

  3. 3

    Read the breakdown

    The difference is shown in multiple formats: total days, weeks + days, and a year/month/day breakdown.

  4. 4

    Optional: toggle business days

    Switch on 'Business days only' to exclude Saturdays and Sundays from the count.

O que é Date Difference Calculator?

Calculate the exact duration between any two dates in years, months, weeks, and days. Find out how many days until a deadline, how long a project lasted, or the gap between two historical events. Optionally count only business days (excluding weekends). All calculations happen in your browser with no sign-up and no data ever leaving your device.

Por que usar Date Difference Calculator?

  • Multiple output formats — see the gap in total days, total weeks, and a human-friendly years/months/days breakdown simultaneously.
  • Business-day mode excludes weekends so you can plan project timelines accurately.
  • Handles leap years and variable-length months without you needing to think about it.
  • Works for any two dates in the Gregorian calendar — past, present, or far future.
  • Completely free with no account required.

Perguntas frequentes

Does it count weekends and holidays?
By default, every calendar day is counted. Toggle the 'Business days only' option to exclude Saturdays and Sundays. Public holidays are not excluded automatically since they vary by country.
Is the start date included in the count?
The start date is included and the end date is excluded, which matches the convention used by most project management and scheduling tools.
Can I calculate differences between dates hundreds of years apart?
Yes. The tool handles any valid date in the Gregorian calendar, making it useful for historical research, genealogy, and academic work.
Is my data safe?
Yes. All processing happens entirely in your browser. Your data never leaves your device and is never uploaded to any server.

Saiba mais

Casos de uso de Date Difference Calculator

Project deadline tracking

Calculate how many working days remain before a product launch, contract deadline, or grant submission date.

Event countdown

Find out exactly how many days, weeks, and months until a wedding, vacation, exam, or retirement date.

Legal and financial calculations

Determine the exact number of days in a contract period, warranty window, or notice period for legal or financial documentation.

Historical and academic research

Calculate the precise duration between historical events — such as the gap between two treaties, reigns, or scientific milestones.

Dicas e boas práticas

  • 💡For project planning, use the business-day count and add a buffer of 10-15% to account for unexpected delays and holidays.
  • 💡Pair this tool with the Age Calculator to find both someone's age and the number of days until their next birthday in one session.
  • 💡Remember that public holidays are not subtracted in business-day mode — manually subtract those for your specific country if precision matters.

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