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Date & Days Calculator

Calculate the number of days between two dates or add/subtract days from a date. Shows business days, weeks, months, and weekday info.

Days Between Two Dates

Start Date

End Date

How the Date & Days Calculator Works

This tool offers two modes for working with dates. Days Between Dates tells you the exact number of calendar days, business days (Monday–Friday), weeks, and months separating any two dates. Add / Subtract Days lets you start from any date and offset it by a given number of days to find the resulting date.

Business Days vs. Calendar Days

Business days exclude Saturdays and Sundays. This is useful for calculating delivery estimates, project timelines, or payment terms (e.g., “Net 30 business days”). Note that public holidays are not excluded from the business day count, since holidays vary widely by country and region.

Common Uses

Counting down days until a wedding, vacation, or deadline
Calculating the number of working days in a project timeline
Finding a future or past date (e.g., “What date is 90 days from today?”)
Determining how many days between two historical events
Tracking age in days or weeks (especially for pregnancies)

Leap Year Handling

This calculator fully accounts for leap years. A year is a leap year if it is divisible by 4, except for years divisible by 100 — unless also divisible by 400. So 2000 was a leap year, but 1900 was not.

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How to Use the Date & Days Calculator

1
Enter your values
Open the Date & Days Calculator and fill in the required input fields with your numbers or selections.
2
Review the calculation
The tool automatically computes the result as you type. Double-check your inputs to ensure accuracy.
3
Interpret your results
Review the calculated output along with any breakdowns, charts, or explanations provided to understand what the numbers mean for your situation.

Sources & Verification

NIST ISO

Published by ConvertCrunch Editorial Team | Our Methodology

Frequently Asked Questions

What is the Date & Days Calculator?

The Date & Days Calculator is a free browser-based tool on ConvertCrunch. Calculate the number of days between two dates or add/subtract days from a date. Shows business days, weeks, months, and weekday info. It requires no downloads, installations, or account signups. Simply enter your values and get instant, accurate results. The tool is designed for quick calculations and informed decision-making, whether you are a professional, student, or everyday user looking for reliable answers.

How do I use the Date & Days Calculator?

Using the Date & Days Calculator is straightforward. Enter your values into the input fields provided on the page, then calculate or adjust parameters to explore scenarios. Most processing happens locally in your browser. If a feature uses a third-party service, the tool identifies that connection and the privacy policy explains it. Most users get the answers they need in under a minute.

Is the Date & Days Calculator free to use?

Yes, the Date & Days Calculator is completely free to use with no account signup, email requirement, or premium tier. Most calculations run locally in your browser. Features that depend on live data or a third-party service require a network connection and are identified in the tool. You can use it as many times as you need for personal, educational, or professional purposes.

How accurate is the Date & Days Calculator?

The Date & Days Calculator uses standard conversion factors and formulas from authoritative sources. For unit conversions, results are mathematically precise. For tools relying on external data (such as currency rates), values are updated regularly but may have a short lag compared to real-time market data. Results are suitable for everyday use, planning, and quick reference.

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