Holiday settings guide
Add custom holidays business day calculations
Need to add custom holidays business day calculations for company closure days or regional public holidays? This guide shows how to add those dates, name them clearly, and avoid missing non-working days so your business day calculator excludes weekends and holidays correctly.
Published: December 28, 2025 · Updated: December 28, 2025 · By FinToolSuite Editorial
Disclaimer
- Educational purposes only; not legal or financial advice.
- Examples are illustrative and simplified.
- Results depend on your inputs and assumptions and are not guaranteed.
- Holiday presets can be static and may not cover regional observances.
- See the Privacy Policy; do not share personal data.
Quick answer: add custom holidays business day calculations
- Preset holiday lists are a starting point, not a full calendar for every region.
- Custom holidays let you model company shutdowns and local observances.
- Always note the year, timezone, and weekend pattern when sharing results.
What counts as a custom holiday
A custom holiday is any non-working date you want to exclude. Examples include a company offsite day, an inventory count day, a regional public holiday, a bank closure, or a winter shutdown. Add them so your schedule reflects the days your teams actually take off.
When you should add custom holidays
- Regional public holidays not covered by presets.
- Company closure days and offsites.
- Strike or shutdown days treated as non-working.
- Extra bank closure days.
- End-of-year shutdown periods.
- One-off public holidays or observances.
- Local civic days that only affect certain locations.
Naming tips and formatting
- Keep names short and consistent: “Company shutdown”, “Local holiday”, “Inventory count”.
- Use a consistent date format and timezone reference.
- Maintain a shared list so teams reuse the same names and dates.
Year boundaries and long timelines
Holiday year matters. If your timeline crosses into the next year, confirm presets for both years and add any missing dates manually. This prevents gaps where next year’s holidays are not yet listed and avoids surprise shifts when you exclude weekends and holidays.
Worked examples
Example A: Add 10 with a closure
Inputs: start Monday, add 10 business days, weekend Sat–Sun, custom holiday on day 6.
Without custom holiday: lands the following Friday.
With custom holiday: lands the following Monday.
Example B: Subtract 5 with a regional holiday
Inputs: deadline Friday, subtract 5 business days, weekend Sat–Sun, custom regional holiday on Wednesday.
Without custom holiday: previous Friday.
With custom holiday: previous Thursday.
Example C: Crossing year end
Inputs: start Dec 20, add 8 business days, weekend Sat–Sun, holidays: Dec 25, Jan 1, custom company day on Dec 29.
Custom holiday shifts the result from Jan 2 to Jan 3.
How to add custom holidays in the calculator
- Choose a country preset and year if you need a base list.
- Enable holiday exclusions.
- Add custom date(s) with optional names for clarity.
- Recalculate and review the breakdown.
- Save the scenario if your workflow supports it.
Use the business day calculator to apply these steps and share dates with confidence.
Common mistakes
- Duplicating a holiday already in the preset.
- Adding the wrong year or timezone day.
- Forgetting to enable the holiday exclusion toggle.
- Mixing weekend rules with holidays or leaving the wrong weekend pattern.
- Not documenting assumptions for stakeholders.
- Missing local or company dates that alter the result.
FAQ
What are custom holidays in this calculator?
Any non-working dates you add, like company closure days or regional holidays not in the preset.
Can I add company closure days?
Yes. Add each closure date so it is excluded from business day counts.
Do I need to name custom holidays?
Names help teams understand the exclusions, but they are optional.
What if the holiday is already in the preset?
Avoid duplicates by checking the preset list before adding custom dates.
Why did my date change after adding a custom holiday?
Extra excluded dates extend the count, shifting the resulting date.
How do I handle timelines across two years?
Check holidays for both years and add missing dates so the range is covered.
Can I export or save my holiday list?
Save or document your list so teams can reuse it; export depends on your workflow.
Is this legal or financial advice?
No. It is educational. Confirm key dates with your advisor.
Calculate business days now
Add custom holidays, set weekends, and see the adjusted result in seconds.