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Add Belgium Working Days

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

When to use

You need a deterministic Belgium working-day offset.

Do not use when: Private-sector statutory core only; substitute dates, public-service/community/regional holidays, sector agreements, employer, school, bank and municipal schedules are not inferred.

Example user requests

Add or subtract Belgium working days around Belgian National Day.
Add or subtract Belgium 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	BE (Belgium).
`territory_name`	string	Belgium
`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	Belgium ten statutory private-sector public holidays for 2026-2027
`holiday_policy`	string	The ten statutory Belgian labour public holidays are included; the public-sector, community, regional, sector and employer calendars are not substituted into this national core.
`substitute_day_policy`	string	No substitute-day closure is inferred. If a statutory holiday coincides with Sunday or an undertaking's ordinary inactivity day, the substitute day is fixed by the competent joint committee or undertaking.
`calendar_profile`	string	belgium-public-holidays
`dataset_version`	string	be-legal-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/belgium-public-add-working-days?start_date=2026-01-01&working_days=0

Machine access

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

Sources

Belgian Federal Public Service Employment – Public holidays (government_labour_guidance)
Belgium.be – legal holidays (government_calendar_reference)
Belgian Federal Public Service Employment – public-holiday regulation (government_regulation_index)

FAQ

Are substitute days included?

No. Belgium fixes a replacement rest day through the competent joint committee or undertaking when a statutory holiday overlaps an ordinary inactivity day; this package preserves the statutory date and does not infer the replacement.

Related calculators

Belgium Working Day — Inspect a date and source evidence.