Date calculator
Two small tools that answer the questions people usually open a calendar for: how many days lie between two dates — including true working days, holiday-aware for 35 countries — and what date it is some days from now. Everything runs in your browser.
Days between two dates
Add or subtract days
The off-by-one everyone hits
“How many days from Monday to Friday” has two honest answers: 4, if you count the nights between them, and 5, if both ends are counted. Deadlines, hotel stays and rentals usually mean the first; billing periods and event durations often mean the second. The calculator defaults to the first and the toggle switches to the second — the answer changes by exactly one either way, which is why so many spreadsheets are off by one.
Working days, done honestly
A “business days” count that ignores public holidays is just a weekday count. Pick a country above and the calculator subtracts its nationwide holidays from the same dataset the calendar maker prints and the working-days tables summarise. Regional holidays stay out — they do not apply to the whole country — and half-day customs are not subtracted.
Questions
Does the count include the end date?
By default no — the difference counts the nights between the dates, the way hotel stays and deadlines usually work, so Monday to Friday is 4 days. Tick “count the last day too” for inclusive counting, which makes Monday to Friday 5 days. The toggle exists because both conventions are common and mixing them up is the classic off-by-one mistake.
How are working days counted?
Working days are Monday-to-Friday weekdays minus the nationwide public holidays that fall on one, using the same holiday data the calendars on this site print. Pick a country to subtract its holidays; regional holidays are not subtracted, since they do not apply to the whole country.
Is anything sent to a server?
The dates you pick are processed in your own browser. Choosing a country loads that country’s public holiday list; the dates themselves never leave your device.