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Date Difference Calculator: Days Between Two Dates

This free date difference calculator finds how long it is between two dates in years, months, days, weeks and total days. It also counts the working days between them.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

The difference between two dates is the time that separates them. People need it to count days until a deadline, the length of a contract, the days since an event or the length of a trip. Because months have 28 to 31 days, the answer in months and days is hard to do by hand.

Pick two dates and read the gap in several units at once.

How to Use This Tool

  1. Choose the start date.
  2. Choose the end date.
  3. Select whether to include the end date.
  4. Press Calculate.

How the Calculation Works

Total days are the difference between the two calendar day numbers, plus one if you include the end date. The years, months and days form is worked out by subtracting year, month and day and borrowing from the previous month. Working days are counted by walking through each day and skipping Saturdays and Sundays.

Worked Example

From 1 January 2026 to 2 November 2026 there are 305 days, which is 10 months and 1 day, or 43 weeks and 4 days. Of those days, 217 are working days.

Common Uses

  • Contract and notice periods.
  • Project timelines.
  • Trip lengths and countdowns.
  • Counting days since an event.

Tips and Common Mistakes

  • Decide whether the end date counts before you share a result.
  • Use the business days calculator to remove holidays.
  • Leap days are included automatically.

Next, you may need the business days calculator, date add and subtract calculator, days until calculator, age calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

By subtracting the calendar day numbers. From 1 to 2 November is one day. Choose "include" if both the first and last days should count, which gives one more.
Days from Monday to Friday. The tool does not know public holidays; use the business days calculator for a holiday list.
Yes. February 29 is counted in leap years.
Yes. The tool swaps them and tells you, so the result is never negative.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.