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Add Global Public-Holiday Reference Working Days

Adds or subtracts working days using the pinned OpenHolidays nationwide public-holiday reference and CLDR weekend rule for a supported country.

When to use

You need a 2026-2028 date offset and accept the OpenHolidays nationwide-only, no-inferred-substitute-day reference semantics.

Do not use when: The task requires a direct official authority, regional/local or employer calendar, substitute-day rules, or dates outside the published coverage.

Example user requests

Add five reference working days to 2026-10-23 in Austria.

Formula

move one Gregorian day at a time; decrement remaining only when the reference status is_working_day=true

The start date is excluded for non-zero offsets. Weekend and included nationwide public-holiday dates are skipped; substitute days are not inferred.

Inputs

Parameter	Type	Unit	Required	Description
`start_date`	date		yes	Gregorian start date in 2026-2028.
`territory`	enum: AD \| AL \| AT \| BE \| BG \| BY \| CH \| CZ \| DE \| EE \| ES \| FR \| HR \| HU \| IE \| IT \| LI \| LT \| LU \| LV \| MC \| MD \| MT \| MX \| NL \| PL \| PT \| RO \| RS \| SE \| SI \| SK \| SM \| VA \| ZA		yes	ISO-style alpha-2 country code supported by the pinned OpenHolidays public-holiday reference snapshot.
`working_days`	integer	working days	yes	Signed offset; the start date is excluded for non-zero offsets. Range: ≥ -1000, ≤ 1000

Outputs

Output	Type	Unit	Description
`start_date`	date		Input date.
`result_date`	date		Date reached.
`working_days_added`	integer	working days	Signed requested offset.
`calendar_days_elapsed`	integer	days	Signed Gregorian difference.
`non_working_weekend_days_skipped`	integer	days	Weekend dates crossed.
`public_holidays_skipped`	list		Included nationwide public-holiday events crossed.
`territory`	string		Normalized uppercase country code.
`territory_name`	string		English country name from the source catalogue.
`weekend_days`	string_list		CLDR weekend convention used as the base rule.
`holiday_names`	string_list		Included nationwide public-holiday names on the date.
`holiday_policy`	string		Nationwide public events only; regional and substitute-day rules are not inferred.
`calendar_scope`	string		Weekday plus nationwide public-holiday reference.
`calendar_profile`	string		global-public-holiday-reference.
`substitute_day_policy`	string		not_inferred.
`source_quality`	string		Open public-source aggregation, not a direct national authority feed.
`dataset_version`	string		Pinned OpenHolidays snapshot version.
`coverage_start`	date		First supported date.
`coverage_end`	date		Last supported date.
`source_commit`	string		Immutable source-data repository commit.

Example

Austria offset across National Day: {"start_date":"2026-10-23","territory":"AT","working_days":5} → {"result_date":"2026-11-02"}

GET https://tttkmbb.com/api/v1/calculate/global-public-holiday-add-working-days?start_date=2026-10-23&territory=AT&working_days=5

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/global-public-holiday-add-working-days (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/global-public-holiday-add-working-days · Markdown: https://tttkmbb.com/everyday/global-public-holiday-add-working-days.md · JSON definition: https://tttkmbb.com/everyday/global-public-holiday-add-working-days.json
MCP: server https://tttkmbb.com/mcp, tool add_global_public_holiday_working_days
OpenAPI operationId: add_global_public_holiday_working_days
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

OpenHolidays API public-holiday data (open_data_aggregation)

FAQ

What if the offset crosses the snapshot boundary?

The call fails with OUT_OF_RANGE rather than extrapolating.

Are substitute days inferred?

This reference package includes only nationwide public events from OpenHolidays for 2026-2028. It excludes regional/local holidays, substitute-day inference, employer, bank, exchange, school, religious and emergency closures. Verify material legal, payroll, banking or settlement decisions against the responsible authority.

Related calculators

Global Public-Holiday Working Day Reference — Inspect the source-labelled status of one date.
Global Working Days Between Dates — Count reference working days in a range.