Deadline With Holidays

Pick a start date, the number of business days the deadline owes you (or the count to back-date by, if you enter a negative number), and a country whose public-holiday calendar should be excluded — the calculator returns the resulting date plus the names of every holiday that fell inside the window. Holidays come from the open-source date-holidays library, which covers 200+ jurisdictions and tracks substitute days when a public holiday falls on a weekend. For a single business-day count without holidays use the add business days tool; for the gap between two known dates use business days between.

Common use cases

• Vendor contract delivery dates. A statement of work says "delivery within 10 business days of signature, exclusive of US federal holidays". Sign on Nov 24 and the calculator shows the actual contractual deadline — Thanksgiving inside the window pushes it from Dec 8 to Dec 9. Get this wrong and you either miss the deadline or pay a penalty for late delivery you did not realise existed.
• Notice periods (employment, leases, regulatory). Many notice periods are stated in business days, with public holidays explicitly excluded. UK redundancy notice, US securities-law disclosure windows, and most lease cure periods all use this convention. Plug in the trigger date and the required count to see the actual notice deadline; the calculator handles the country selection so you do not need to memorise federal/state/national-day calendars.
• Court filing deadlines. Court rules in most jurisdictions extend deadlines past the next business day when the calculated date falls on a weekend or holiday. The calculator does NOT roll forward automatically — it just tells you the calendar date — but the explicit list of skipped holidays makes it easy to spot the case where you need to add another day per local rules.
• Service-level agreement (SLA) breach windows. Enterprise support contracts often quote "respond within 2 business days, resolve within 5 business days". Use this calculator with the customer's country to compute the resolution deadline, accounting for whatever holidays apply to their support timezone. For hour-precise SLAs use the SLA deadline tool instead — that handles within-day arithmetic.

How it works

The calculator walks forward from the start date one calendar day at a time. Each cursor day is classified: weekend (Saturday or Sunday) → skip and increment the weekend counter; in the holiday set → skip and append to the skipped-holidays list; otherwise → count one business day. The walk continues until the requested count is reached, then the cursor date is returned. Negative business-day counts walk backwards using the same rules, which is useful for "what date is N business days before the deadline" questions. The holiday set is delivered to the page server-side from the date-holidays dataset (about 10 MB) so the client bundle stays small; see /tools/business-days-between for the same pattern in a different calculator.

Worked examples

Edge cases & gotchas

• Substitute days are included. When a public holiday falls on a weekend, most jurisdictions move the day off to the nearest weekday — Friday for a Saturday holiday in the US, Monday for a Sunday holiday in the UK. date-holidays exposes both the original date and the substitute as separate "public" holidays, so both get skipped by the calculator. Be aware that this can double-count: in 2026 US Independence Day is Saturday July 4 and the substitute is Friday July 3, so both are in the skip set.
• Regional holidays are NOT included by default. date-holidays separates national, regional, and observance holidays. The calculator only excludes type "public" holidays — that is, the federally / nationally observed days. State holidays (Texas Independence Day, California Cesar Chavez Day) and observances (Earth Day, Mother's Day) are NOT excluded. If your contract specifies "state holidays included" you need to add those dates manually.
• Workweek is fixed at Monday-Friday. The calculator treats Saturday and Sunday as non-working days everywhere — which is wrong for jurisdictions where the working week is Sunday-Thursday (Saudi Arabia, much of the Gulf) or Sunday-Friday (Israel before 2003). For these markets, use the business days between tool which exposes a workweek picker, or compute manually.
• Holiday data is current as of build time. date-holidays releases new versions when a country reschedules holidays (which happens often — UK gov sometimes adds bank holidays for royal events; US states create new commemorations). The dataset baked into this site is current at deploy; if a country adds a holiday after that, it will not be reflected until the next deploy. For long-range deadlines (>12 months) verify the holiday list against the official source for the relevant country.

Frequently asked questions about Deadline With Holidays

Glossary

Business day

A weekday that is neither a weekend day (Saturday/Sunday in this calculator) nor a public holiday in the selected country. The starting date is itself not counted as a business day; counting begins the day after.

Public holiday

A day of statutory closure recognised at the national/federal level. date-holidays distinguishes "public" from "bank", "school", "optional", and "observance" — only "public" days are excluded by this calculator.

Substitute day

When a public holiday falls on a weekend, many jurisdictions designate the nearest weekday as the day off (Friday in the US, Monday in the UK). Both the original date and the substitute appear in the holiday set, so both are excluded from the working-day count.

Bridge day (puente)

A working day sandwiched between a public holiday and a weekend, often declared a holiday by ad-hoc government decree (common in Spain, Mexico, France). The calculator recognises legislated bridges (Mexico's movements) but not ad-hoc government decrees announced after deployment.

Day-of-skip semantics

When the cursor lands on a weekend or holiday during the count, the calculator skips that day without consuming any of the requested business days. This means the resulting deadline can be many calendar days past N if the window contains long stretches of holidays (e.g. the UK Easter / Christmas weeks).

date-holidays

The open-source library used to compute public holidays for 200+ jurisdictions. Combines fixed-date holidays, weekday-of-month rules (4th Thursday in November), Easter-relative dates, lunar calendars (Eid, Diwali), and substitute-day logic into a single API.