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Add Global Reference Working Days

Adds or subtracts working days using the pinned OpenWorkdays national-scope reference for 246 country/territory codes.

When to use

You need a broad 2026-2028 date offset and accept OpenWorkdays reference semantics, including its source observed/estimated flags.

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

Example user requests

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

Formula

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

The start date is excluded for non-zero offsets. Skip source weekends and public-holiday events; preserve source flags in the result.

Inputs

Parameter	Type	Unit	Required	Description
`start_date`	date		yes	Gregorian start date in 2026-2028.
`territory`	enum: AD \| AE \| AF \| AG \| AI \| AL \| AM \| AO \| AR \| AS \| AT \| AU \| AW \| AX \| AZ \| BA \| BB \| BD \| BE \| BF \| BG \| BH \| BI \| BJ \| BL \| BM \| BN \| BO \| BQ \| BR \| BS \| BT \| BW \| BY \| BZ \| CA \| CC \| CD \| CF \| CG \| CH \| CI \| CK \| CL \| CM \| CN \| CO \| CR \| CU \| CV \| CW \| CX \| CY \| CZ \| DE \| DJ \| DK \| DM \| DO \| DZ \| EC \| EE \| EG \| EH \| ER \| ES \| ET \| FI \| FJ \| FK \| FM \| FO \| FR \| GA \| GB \| GD \| GE \| GF \| GG \| GH \| GI \| GL \| GM \| GN \| GP \| GQ \| GR \| GS \| GT \| GU \| GW \| GY \| HK \| HN \| HR \| HT \| HU \| ID \| IE \| IL \| IM \| IN \| IQ \| IR \| IS \| IT \| JE \| JM \| JO \| JP \| KE \| KG \| KH \| KI \| KM \| KN \| KP \| KR \| KW \| KY \| KZ \| LA \| LB \| LC \| LI \| LK \| LR \| LS \| LT \| LU \| LV \| LY \| MA \| MC \| MD \| ME \| MF \| MG \| MH \| MK \| ML \| MM \| MN \| MO \| MP \| MQ \| MR \| MS \| MT \| MU \| MV \| MW \| MX \| MY \| MZ \| NA \| NC \| NE \| NF \| NG \| NI \| NL \| NO \| NP \| NR \| NU \| NZ \| OM \| PA \| PE \| PF \| PG \| PH \| PK \| PL \| PM \| PN \| PR \| PS \| PT \| PW \| PY \| QA \| RE \| RO \| RS \| RU \| RW \| SA \| SB \| SC \| SD \| SE \| SG \| SH \| SI \| SJ \| SK \| SL \| SM \| SN \| SO \| SR \| SS \| ST \| SV \| SX \| SY \| SZ \| TC \| TD \| TF \| TG \| TH \| TJ \| TK \| TL \| TM \| TN \| TO \| TR \| TT \| TV \| TW \| TZ \| UA \| UG \| UM \| US \| UY \| UZ \| VA \| VC \| VE \| VG \| VI \| VN \| VU \| WF \| WS \| XK \| YE \| YT \| ZA \| ZM \| ZW		yes	ISO-style alpha-2 country code supported by the pinned OpenWorkdays 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	Regular weekend dates crossed.
`public_holidays_skipped`	list		Source public-holiday events crossed.
`territory`	string		Normalized uppercase country code.
`territory_name`	string		Calcgrid display name; TW is displayed as 中国台湾省 while the machine code remains TW.
`source_territory_name`	string		Raw country name from the hash-pinned OpenWorkdays source catalogue.
`weekend_days`	string_list		Weekend convention supplied by the source country file.
`working_weekend_day`	boolean		True when the source explicitly marks a weekend date as an official working day.
`holiday_names`	string_list		Included national-scope public-holiday names on the date.
`holiday_observed`	boolean		True when an included event is marked observed by the source.
`holiday_estimated`	boolean		True when an included event is marked estimated by the source.
`holiday_policy`	string		National-scope events with source observed/estimated flags preserved.
`calendar_scope`	string		National reference plus country weekend and explicit working-weekend dates.
`calendar_profile`	string		global-working-day-reference.
`substitute_day_policy`	string		Source flags are preserved; no new substitute-day rule is inferred.
`source_quality`	string		Open derived reference, not a direct national authority feed.
`dataset_version`	string		Pinned OpenWorkdays snapshot version.
`coverage_start`	date		First supported date.
`coverage_end`	date		Last supported date.
`source_url`	string		Pinned OpenWorkdays source index.

Example

Australia offset: {"start_date":"2026-10-23","territory":"AU","working_days":5} → {"result_date":"2026-10-30"}

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

Machine access

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

Sources

OpenWorkdays generated public-holiday and working-day data (open_derived_reference)

FAQ

What if the offset crosses the snapshot boundary?

The call fails with OUT_OF_RANGE rather than extrapolating.

Are regional closures included?

This is a broad national-scope reference generated from an open rules-based library. It may omit regional, employer, bank, exchange, school or one-off authority closures, and future lunar/late-proclaimed dates can be marked estimated. Verify material legal, payroll, banking or settlement decisions against the responsible authority.

Related calculators

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