How do I count the days between two dates?

Pick a date in From and one in To. The result shows years, months and days, plus Total days, Total weeks, Total hours and Working days. Quick presets such as Today to 30 days fill both dates for you.

How are working days calculated?

Working days count Monday to Friday between the two dates. Weekends are skipped. Public holidays are not taken into account, so subtract them yourself if they fall inside the range.

Does it count the start and end date?

By default the last day is not counted. Tick Include end date (count the last day) to add it, for example to count both the first and last day of a trip or contract.

What if my From date is later than the To date?

The tool shows a notice that the From date is later and displays the absolute difference. You can also use Swap dates to reverse them.

How can I save or share a result?

Use Copy result to copy a text summary with the years, months, days, total days and working days. The chosen date pair is also written into the page URL, so you can bookmark or share the link.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

📅

Free Date Difference Calculator

Calculate the exact difference between two dates — years, months, days, weeks, working days (excluding weekends), hours, and minutes.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever

Works offline once loaded

From

Quick presets

Include end date (count the last day)

Select both dates to see the difference.

Common uses

Calculate Days Until Due DateCount down to the baby's due date — find out exactly how many weeks, days, and hours until the big day.
Days Until Your VacationCount down to your trip with working days, total days, and weeks remaining for planning purposes.
Working Days to Project DeadlineCalculate the exact number of working days (excluding weekends) between today and a project deadline.
Calculate Anniversary Days TogetherFind out exactly how many days, months, and years you've been together with someone special.
Age Gap Calculator Between Two PeopleCalculate the exact age difference between two birthdays — years, months, and days apart.

How It Works

All calculation runs entirely in the browser using hand-written UTC arithmetic — no external library, no server request. The tool parses YYYY-MM-DD strings into calendar components, computes differences using Date.UTC() millisecond timestamps to avoid DST drift, and iterates day-by-day to count Monday–Friday working days.

1
Safe date parsing
Each date string is validated with a regex and then reconstructed via Date.UTC() — not new Date(string) — so that users west of UTC never see a weekday shift caused by the browser's local-timezone interpretation of date-only inputs.
2
UTC millisecond subtraction
The two calendar dates are converted to UTC midnight timestamps with Date.UTC(y, m, d). Integer division by 86,400,000 ms gives an exact whole-day count that is immune to daylight-saving transitions, which can otherwise make a day appear 23 or 25 hours long.
3
Calendar breakdown and working-day count
A hand-written year/month/day decomposition handles month-length irregularities (borrowing days from the preceding month when needed). A separate loop steps through every UTC day between the two dates and increments a counter only for Monday–Friday (getUTCDay() !== 0 or 6), producing an exact working-day total regardless of locale.
4
Results displayed in all units
The totals are formatted with toLocaleString() using the page locale for locale-aware digit grouping, then shown simultaneously as years/months/days, total days, working days, weeks, hours, and minutes. The current date pair is written into the URL via history.replaceState so any result can be bookmarked or shared as a direct link.