How do I calculate the number of days between two dates?

Enter a start date and an end date using the two calendar fields. The calculator immediately shows the total number of days between them, along with weeks, business days, and months.

Can I calculate dates that are years apart?

Yes. There is no limit on the date range. The calculator handles multi-year spans and correctly accounts for leap years in the total-days count.

What if the end date is before the start date?

The calculator computes the absolute difference between the two dates regardless of order, and labels the result as 'ago' when the end date is in the past relative to the start date. You can also use the swap button to quickly reverse the two dates.

Is my data stored or sent anywhere?

No. All calculations run entirely in your browser using JavaScript. The dates you enter are never sent to or stored on any server.

How are months and years calculated?

The calendar breakdown (years, months, days) counts full calendar periods — for example, from 1 January to 15 March is 2 months and 14 days. The 'Months' detail card shows an approximate figure based on an average month length of 30.44 days.

100% browser-based · nothing stored

Date Calculator

Find the exact difference between any two dates — in days, weeks, business days, months, and years. Pick a start and end date and the result appears instantly. All calculations run entirely in your browser; nothing is stored or transmitted.

Start Date

End Date

Enter both dates above to see the difference

How It Works

Enter the start date

Click the Start Date field and pick any date from the calendar. There is no range limit — dates decades apart work just as well.

Set the end date

The End Date defaults to today. Change it to any past or future date. Use the swap button to reverse the two dates instantly.

Read the results

The total days appear immediately, followed by weeks, business days, months, and a calendar breakdown of years, months, and remaining days.

Why users trust this tool

✓ Your data never leaves your device — the calculation runs entirely in your browser, not on our servers, so the dates you enter are never stored or shared.
✓ Instant results — there is nothing to upload; the answer updates the moment you change either date field.
✓ No account needed — just open the page and start calculating straight away.

How the Date Difference Is Calculated

Each output is derived from the exact number of milliseconds between the two dates, then converted into the relevant unit. Leap years are automatically accounted for in every figure.

Output	What it means
Total days	The exact count of calendar days between the two dates, inclusive of leap-year days.
Weeks	Total days divided by 7, rounded down to the nearest complete week.
Business days	Calendar days with Saturdays and Sundays excluded. Public holidays are not removed as they vary by country.
Months	An approximate figure based on an average month length of 30.44 days, rounded down.
Calendar breakdown	The difference expressed as full years, remaining months, and remaining days — e.g. "1 year, 2 months, 5 days".

Common Uses

Project planning: count the working days available between a kickoff date and a deadline.
Contract duration: verify the exact number of days a contract or lease runs.
Event countdowns: find out how many days until a wedding, trip, or launch date.
Legal & compliance: confirm notice periods, filing deadlines, and statutory timeframes.
Anniversaries & milestones: calculate how long ago a past event occurred.
Payroll & billing: determine the number of business days in a pay period.

Features

Total days: precise count of every calendar day between the two dates.
Business days: weekends excluded for work and scheduling contexts.
Weeks and months: derived automatically from the day count.
Calendar breakdown: years + months + days expressed as full periods.
Swap button: reverse start and end dates with one click.
Fully private: nothing is uploaded or stored — the entire calculation runs in your browser.

Frequently Asked Questions

How do I find the number of days between two dates?

Enter a start date and an end date using the two calendar fields at the top of the page. The total number of days appears instantly in the blue result card.

Does the calculator include the start date and end date in the count?

The calculator counts the span between the two dates exclusively — the same way you would count "days of travel" rather than "nights". If you need an inclusive count, add 1 to the result.

How are business days counted?

Business days are Monday through Friday. Saturdays and Sundays are excluded. Public holidays are not removed because they vary by country and region — you can subtract them manually once you have the base figure.

Can I calculate a date range that spans multiple years?

Yes, there is no range limit. Multi-year spans work perfectly and leap years are automatically included in the total-days count.

What does the calendar breakdown show?

The breakdown row (shown below the primary result) expresses the difference as full calendar years, remaining months, and remaining days — similar to how you might describe the gap as "1 year, 4 months, and 12 days".

Is my data safe?

Yes. All calculations run entirely in your browser — nothing is sent to or stored on any server.