Add Working Days to a Date

How the Add Working Days To A Date works

The formula. Step forward one day at a time, counting only Monday-to-Friday dates that are not public holidays, until the count is reached. For example, 5 working days from Monday 21 September 2026 is Monday 28 September, 7 calendar days on. A second example: 10 working days lands on Monday 5 October, 14 calendar days on, with no holidays in the way. Each holiday in the range pushes the result one working day further, and the readout shows how many were skipped.

"Working days" or "business days" means Monday to Friday excluding public holidays. Ten working days from a Monday is not ten days later; it is two full weeks later, and a bank holiday in between pushes it to the Tuesday. That is the sum this page does, and it does it both ways: a delivery promised in five working days, a notice period counted in business days, a statutory deadline such as the 14 working days for a complaint response, or a contract that says something must be done "not less than 20 business days before".

How the count works. The start date itself is not counted. The calculator steps one day at a time in the chosen direction, skipping any Saturday, Sunday or public holiday, and stops when it has passed the requested number of working days. If the start date is itself a weekend or holiday, counting begins from the next qualifying day in the direction of travel, which is the convention used by most courts and contracts. When the number is zero, the result is the start date itself.

Which holidays are skipped. The regions list covers the four UK nations (which differ: Scotland has 2 January and St Andrew's Day but no Easter Monday, and Northern Ireland adds St Patrick's Day and 12 July), Ireland, the United States federal calendar, Canadian federal holidays, New Zealand including Matariki, and Australia nationally plus each state and territory. Where a holiday falls on a weekend the substitute day is used, so Christmas Day on a Saturday is skipped on the following Monday rather than on the Saturday. In the United States a Saturday holiday is observed on the Friday before.

What is not skipped. Regional and local holidays below the level listed, such as Australian show days, Canadian provincial days, US state holidays, and company shutdowns, are not in the calendar. If your contract or organisation treats such days as non-working, add them to the working-day count manually or use the working days between two dates calculator, which has a box for extra days off.

Checking a deadline. For a deadline that says "within N working days of" an event, set the event date as the start and add N. The result is the last day on which the action is on time. For "at least N working days before", set the target date as the start, choose Subtract and read off the latest date you can act.

Add working days to a date: from 21 September 2026

Counting forward from Monday 21 September 2026 with England and Wales bank holidays.

Date reached after adding working days to 21 September 2026

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