Date Difference Calculator

Free browser-based tool. Use the controls below to get started.

QUICK GUIDE

Find the time between two dates

Select a start date and an end date to see the difference. Example: 1 January to 11 January is 10 elapsed days when counting the difference between dates, not both endpoints.

Choose the start date

Follow the fields and controls shown in the tool above.

Choose the end date

Check the selected settings and input values before continuing.

Read the calculated difference and check inclusive/exclusive counting

Review the output before copying, saving, or sharing it.

Processing behavior depends on the tool and browser. Do not use confidential or sensitive content unless you have confirmed how that specific tool handles it.

Read the full guide

ABOUT THIS TOOL

About the Date Difference Calculator

Use the Date Difference Calculator to see how much time lies between two calendar dates. Pick a start date and an end date and the tool shows the gap as a total number of days and as years, months and days.

It helps with project deadlines, countdowns to an event, notice periods, contract terms and travel planning. Everything is calculated in your browser.

Tips for best results

Decide whether the end date should count. From 1 January to 11 January is 10 days elapsed, but 11 days if you count both dates.
If you enter the dates in reverse order, check that the result still makes sense for your purpose.
For someone's age on a date, the Age Calculator gives a more direct answer.

Frequently asked questions

How do I count the days between two dates?

Choose the earlier date as the start and the later date as the end. The tool returns the elapsed days between them.

Is the end date included?

The result is the elapsed difference. If your rule counts both the first and the last day, add one day.

Does it handle leap years?

Yes. The calculation uses real calendar dates, so leap days are included when they fall in the range.