United Kingdom · Working-day arithmetic
Add 5, 10 or 20 UK working days: nation and start-day examples
Compare England and Wales, Scotland and Northern Ireland using a November-to-December 2026 example. Record the start-day rule before sharing a date.
Direct answer
Why can adding five working days give a different date in Scotland?
A working-day result depends on the selected nation, the weekly schedule and whether the start date counts. GOV.UK lists separate bank holiday calendars for England and Wales, Scotland and Northern Ireland. In the example below, Scotland excludes St Andrew’s Day on 30 November 2026, while the other two calendars do not. The dates assume Monday-to-Friday work and all listed bank holidays off; a service or contract may define a different rule.
Source checked 2026-09-25: GOV.UK: bank holidays and national calendars. GOV.UK: official machine-readable holiday dates.
Start Friday 27 November 2026; exclude the start date
| Calendar | Add 5 days | Add 10 days | Add 20 days |
|---|---|---|---|
| England and Wales | Friday 4 December | Friday 11 December | Tuesday 29 December |
| Scotland | Monday 7 December | Monday 14 December | Wednesday 30 December |
| Northern Ireland | Friday 4 December | Friday 11 December | Tuesday 29 December |
In England and Wales, 30 November is day 1 and 4 December is day 5. In Scotland, 1 December is day 1 because 30 November is a bank holiday, so 7 December is day 5. The 20-day examples also skip Christmas Day and the Boxing Day substitute on 28 December. If you include 27 November instead, the five-day result becomes 3 December in England and Wales or Northern Ireland, and 4 December in Scotland.
Checklist controls
- Choose the nation applying to the actual service or workplace.
- Record the start date, number of days and whether the start date counts.
- Apply the weekly schedule and remove applicable holiday dates only once.
- Check service cut-offs and extra closures separately before promising the date.
Frequently asked questions
Does a working-day date guarantee a delivery or payment arrival?
No. This is calendar arithmetic. A provider may use a cut-off time, settlement rule or definition of working day that changes its promise. Save the provider’s terms beside the calculation; do not turn a general date into a guaranteed arrival time.
Independent UK calendar guide. Examples use official dates checked on 25 September 2026 and a stated Monday-to-Friday schedule. Part-time rotas, local holidays, legal deadlines and employer leave rules require their own checks.
Check your date range with the calculator · Read the complete national holiday lists