Support: Date Difference Calculator

Tell us what happened. Include which page you were on and what you expected to see. Most answers go out within a business day.

Common questions

How many days are between two dates?

Set From and To and read the big number: the count of days from the first date to the second, not counting the first day, which is how deadlines and interest are usually counted. Tick Count the end date too to include both days.

How are business days counted?

Every day from the day after the start date to the end date that is not a Saturday or Sunday, and not a US federal holiday if that option is ticked. Tick Count the end date too and the start day is included when it is a working day.

Which holidays are skipped?

The US federal holidays as observed, from the Office of Personnel Management's lists for 2026 and 2027 (read 5 October 2026): New Year's Day, Martin Luther King Jr. Day, Washington's Birthday, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving and Christmas, on their observed dates when they fall on a weekend. State, company and other countries' holidays are not included.

How is the years, months and days figure worked out?

The way ages are: whole years first, then whole months at their real lengths, then the days left over. 31 January to 1 March is 1 month and 1 day.

What happens when I add a month to 31 January?

The result is the last day of February, since February has no 31st. Months and years keep the day of the month where it exists and otherwise use the last day, which is the usual rule in contracts and calendars.

Can I count business days forward from a date?

Yes. Choose Add or subtract days, set the unit to business days and the number, and the date that many working days ahead (or back, with before) is shown, skipping weekends and, if ticked, holidays.

Does it use my time zone?

No. Dates are whole calendar days, so there is no time of day or zone involved; the same two dates give the same answer anywhere.

Is it free?

Yes, completely free, with no sign-up.