Quick answer
Most business-day mistakes come from counting weekends, missing holidays, using the wrong country calendar, or including the wrong start date.
Key takeaways
- Check whether the start date counts.
- Use the right country holiday calendar.
- Review a visual breakdown before relying on a deadline.
Mistake 1: counting weekends
Business days normally exclude Saturdays and Sundays. Counting calendar days instead can make a deadline look earlier than it really is.
Mistake 2: forgetting public holidays
Public holidays can shift dates, especially around Christmas, Easter, and national holidays. If the rule excludes holidays, the deadline moves.
Mistake 3: including the wrong start date
Some calculations include the start date. Others begin on the next business day. This small difference can change the answer by a full day.
Mistake 4: using the wrong country
A UK holiday calendar is not the same as a US or Ireland holiday calendar. Always use the country that matches the policy or organisation involved.
Useful official resources
These sources are directly relevant to the date, public holiday, delivery, SLA, or complaint-handling topic covered in this article.
Related video searches
If you prefer a video explanation, these searches can help you find relevant explainers on YouTube.
Use bizdaycalc to reduce manual counting errors and review the dates visually.
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