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Days Between Dates Calculator

How to calculate days between dates?

The Days Between Dates Calculator computes the exact difference between any two calendar dates in multiple units simultaneously: total calendar days, complete weeks (with remaining days), approximate months, approximate years, and working days (Monday through Friday, excluding weekends). All calculations automatically handle leap years and months with different lengths, so results are always accurate regardless of the date range selected.

Date calculations are essential in project management, legal contracts, payroll, loan terms, and event planning. Knowing the exact number of working days in a contract period affects cost estimates and billing. Calculating the days remaining until a deadline creates urgency and supports prioritization. Counting business days between milestones matters for onboarding schedules and HR compliance. Anniversary and birthday countdowns are popular personal uses. The quick presets (7, 30, 100 days, 1 year from today) skip manual entry for the most common scenarios.

The calculation uses the proleptic Gregorian calendar — the global civil calendar used in nearly all countries. Working day calculations exclude Saturdays and Sundays but do not subtract public holidays, which vary by country and region. For business purposes where public holidays matter, adjust the result manually. All calculations run locally in your browser, so the tool works offline once the page is loaded.

Frequently Asked Questions

How do I calculate the number of days between two dates?
Select a start date and end date using the date pickers, then click Calculate. The exact difference in total days, complete weeks, months, years, and working days is shown simultaneously.
How many working days are between two dates?
The calculator shows working days separately, counting only Monday through Friday and excluding weekends. This is useful for project planning, billing cycles, and business contract deadlines.
Can I calculate how many days until a future date?
Yes. Set today as the start date and your future target as the end date. The result shows the exact countdown in days, weeks, months, and other units.
Does the calculator account for leap years?
Yes. Leap years (every 4 years, with century-year exceptions) are handled automatically. February 29 is correctly included when it falls within the date range.
What is the difference between calendar days and working days?
Calendar days count every day including weekends and holidays. Working days count only Monday through Friday, excluding Saturdays and Sundays — but public holidays are not excluded automatically.
How do I calculate days from today to a specific date?
Use the quick preset buttons (7 days, 30 days, 1 year from today) for common ranges, or manually set today as the start date and enter your target as the end date.
Can I use this for business contract deadline calculations?
Yes. The working days feature is specifically useful for business timelines. Enter your contract start and end dates to see exactly how many business days fall within the period.