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Add Netherlands Working Days

Adds or subtracts Netherlands authority-scope working days in exact coverage.

When to use

You need a deterministic Netherlands working-day offset.

Do not use when: A public holiday is not automatically a paid day off for every Dutch employee. CAO, employment contract, sector, employer, school, bank and municipal schedules are not inferred; Liberation Day arrangements may be five-year/CAO dependent.

Example user requests

Add or subtract Netherlands working days around King's Day.
Add or subtract Netherlands working days around Ordinary weekday.

Formula

move one day at a time; decrement only on status.is_working_day=true

Skip Saturday/Sunday and exact pinned authority events; do not add unverified substitute days.

Inputs

Parameter	Type	Unit	Required	Description
`start_date`	date		yes	Gregorian start date in 2026-2027.
`working_days`	integer		yes	Signed offset; start date excluded for non-zero offsets. Range: ≥ -1000, ≤ 1000

Outputs

Output	Type	Description
`start_date`	date	Input date.
`result_date`	date	Date reached.
`working_days_added`	integer	Signed requested offset.
`calendar_days_elapsed`	integer	Signed Gregorian difference.
`public_holidays_skipped`	list	Exact events crossed.
`territory`	string	NL (Netherlands).
`territory_name`	string	Netherlands
`day_type`	string	Deterministic classification: official_weekend, regular_workday, or the first published authority event kind.
`holiday_names`	string_list	Events applying on the date.
`holiday_kinds`	string_list	Authority event classifications.
`holiday_details`	list	Structured event details, including partial-day notes where published.
`calendar_scope`	string	Netherlands official public holidays for 2026-2027; employee day-off status remains CAO/contract dependent
`holiday_policy`	string	Official public-holiday dates are included; no universal employer closure is inferred because Dutch law leaves the day-off entitlement to the CAO or employment contract.
`substitute_day_policy`	string	No substitute-day closure is inferred; sector, CAO, employer and alternative-religious-holiday arrangements require separate evidence.
`calendar_profile`	string	netherlands-public-holidays
`dataset_version`	string	nl-public-holidays-2026-2027.1
`sources`	list	Authority and legislation sources.

Example

Zero offset is identity: {"start_date":"2026-01-01","working_days":0} → {"result_date":"2026-01-01","working_days_added":0}

GET https://tttkmbb.com/api/v1/calculate/netherlands-public-add-working-days?start_date=2026-01-01&working_days=0

Machine access

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

Sources

Government of the Netherlands – official public holidays 2026 and 2027 (government_calendar_reference)
Rijksoverheid – officiële feestdagen (government_guidance)
Business.gov.nl – public holidays and holiday entitlement (government_business_guidance)

FAQ

Does this prove an employee is legally off work?

No. It identifies an official public holiday. Check the applicable CAO or employment contract for the employee day-off rule.

Related calculators

Netherlands Working Day — Inspect a date and source evidence.