Real holiday calendars and per-country weekends, the same data the API serves. Pick a region, pick a calculation, get a date you can rely on.

A few dozen free calculations a day. Need this in code? The API answers the same questions in one GET request, and the playground covers the fancier ones: due dates, paydays, bridge days.

Why a maintained calendar matters

Weekends are not universal: much of the Middle East rests Friday and Saturday, Nepal only Saturday. Holidays move: when Christmas lands on a weekend, the UK observes substitute days that appear in no fixed-date table. Markets close when offices stay open. Correct business-day math is a data problem before it is an algorithm problem.

More calculators

Invoice due datesPayroll datesHoliday calendarsCommon working daysSettlement dates (T+1/T+2)SLA deadlines

Country calculators

Each page carries that country's upcoming holidays and weekend rule.