How are days between dates calculated?

The tool computes the calendar difference in years, months, and days, plus total elapsed days, weeks, and hours between the two dates.

Does it account for leap years?

Yes. Date arithmetic uses the actual calendar, including leap years and varying month lengths.

What if the end date is before the start date?

The absolute duration is shown regardless of order — you'll see a note that the end date is before the start date.

How is this different from Age Calculator?

Age Calculator computes age from a birth date to today. Date Difference works between any two dates you choose.

Are my dates stored or uploaded?

No. All calculations happen locally in your browser.

Everyday

Date Difference Calculator

Calculate days, weeks, months, and years between two dates — free online date duration calculator.

100% client-side — your data never leaves this tab

Start dateEnd date

Difference

Duration

2y 5m 12d

Total days: 894
Total weeks: 127
Total hours: 21,456

Loading tool…

What is Date Difference Calculator?

Date Difference Calculator finds the exact duration between two dates — total days, weeks, hours, and a breakdown in years, months, and days. Use it for project deadlines, event countdowns, employment tenure, pregnancy tracking, or visa duration checks. Free, instant, and private — dates never leave your browser.

Date difference calculations run entirely in-browser; dates are never uploaded.

How to use Date Difference Calculator

1Select a start date and end date.
2View the duration in years, months, and days.
3Check total days, weeks, and hours for precise planning.
4Swap dates mentally if end is before start — the tool shows the absolute difference.

Examples

Project deadline

Start: 2026-01-01 · End: 2026-06-30 → ~181 days

Tenure calculation

Joining: 2022-03-15 · Today → years, months, days of service

Tips & common mistakes

Use total days for precise countdowns and billing cycles.
For legal or official duration, verify with the exact cutoff date on the notice.
Pair with Age Calculator when you need age from a birth date instead.
End date before start date still shows the correct absolute duration.

Who uses this tool?

Professionals tracking days until project milestones or contract expiry.
HR teams calculating employment tenure for benefits.
Students counting days until exam or result dates.
Travelers planning trip duration between departure and return.

Frequently asked questions

How are days between dates calculated?: The tool computes the calendar difference in years, months, and days, plus total elapsed days, weeks, and hours between the two dates.
Does it account for leap years?: Yes. Date arithmetic uses the actual calendar, including leap years and varying month lengths.
What if the end date is before the start date?: The absolute duration is shown regardless of order — you'll see a note that the end date is before the start date.
How is this different from Age Calculator?: Age Calculator computes age from a birth date to today. Date Difference works between any two dates you choose.
Are my dates stored or uploaded?: No. All calculations happen locally in your browser.