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Add Thailand Working Days

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

When to use

You need a deterministic Thailand working-day offset.

Do not use when: This is a Bank of Thailand financial-institution calendar, not a universal Thai employee, government, employer, exchange or payment-settlement calendar. Bangkok-only, Islamic-bank and southern-branch conditions remain explicit and are not generalized.

Example user requests

Add or subtract Thailand working days around 2027 substitution.
Add or subtract Thailand working days around Bangkok-only event remains conditional.

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	TH (Thailand).
`territory_name`	string	Thailand
`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	Thailand financial institutions and specialized financial institutions
`holiday_policy`	string	BOT_published_financial_institution_and_specialized_financial_institution_holidays
`substitute_day_policy`	string	BOT_substitution_events_are_pinned; no new substitution is inferred
`calendar_profile`	string	thailand-bot-financial-holidays
`dataset_version`	string	th-bot-financial-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/thailand-financial-add-working-days?start_date=2026-01-01&working_days=0

Machine access

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

Sources

Bank of Thailand financial-institution holidays (central_bank_official_calendar)
BOT notification index (central_bank_official_notice_index)

FAQ

Does this cover every Thai worker?

No. It is limited to financial institutions and specialised financial institutions under BOT's published calendar.

Are Islamic-bank and southern-branch Eid dates included?

No fixed date is guessed. BOT says those extra holidays depend on the Sheikhul Islam Office and branch conditions.

Is the Bangkok 2026 special holiday nationwide?

No. It remains a conditional event and is not counted as a nationwide closure by the default calculator.

Related calculators

Thailand Working Day — Inspect a date and source evidence.