How it is worked out
deadline = start date + term, counting whichever kind of day applies
Why it is done this way
A term has three things people forget: when it starts running, which days it counts, and what happens if it lands on a holiday. Most often it starts the day after notice or issue, commercial terms run in calendar days and administrative ones in business days, and a deadline falling on a non-working day moves to the next working one.
Step by step
- Find the day the term starts running: normally the day after the start date
- Count the days of the term, skipping weekends and holidays if they are business days
- If the term runs in months, step month by month and clip the day when the month is shorter
- Check whether the resulting day is a working day
What is worth knowing
Holidays are not filled in for you, and that is deliberate: no two public holiday calendars are alike, they change by country, region and town, and publishing one list here would mean vouching for it where it does not apply. Write them separated by commas in YYYY-MM-DD format and they will be skipped. The page flags a deadline that lands on a non-working day, but check the rule that governs your term, because not every procedure moves it the same way.