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Global Working Day Reference

Checks a date across 246 country/territory codes using a pinned OpenWorkdays national-scope public-holiday reference, country weekend rules and explicit working-weekend dates, with estimated/observed flags and non-authority limits.

When to use

You need broad 2026-2028 working-day reference coverage and accept national-scope open-derived semantics rather than a direct authority calendar.

Do not use when: You need an official direct authority, a regional/employer/bank/exchange calendar, a legal determination, or a date outside 2026-2028; use the official China/UK package or the CLDR baseline as appropriate.

Example user requests

Is 2026-10-26 a working day in Australia using the broad national reference?
Check 2027-02-25 in Saudi Arabia and show whether the holiday date is estimated.

Formula

is_working_day = not source_weekend(date) and not source_public_holiday(date, country); explicit source working-weekend dates override the weekend classification

Resolve the pinned country weekend convention, explicit working-weekend dates and source holiday events. Preserve observed/estimated flags; do not infer new substitute days or regional closures.

Inputs

Parameter	Type	Unit	Required	Description
`date`	date		yes	Gregorian date from 2026-01-01 through 2028-12-31.
`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.

Outputs

Output	Type	Description
`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.
`weekday`	string	Gregorian weekday.
`is_working_day`	boolean	True when the date is neither a source country weekend nor an included public-holiday event.
`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 National Day: {"date":"2026-10-26","territory":"AU"} → {"is_working_day":true,"holiday_names":[]}

GET https://tttkmbb.com/api/v1/calculate/global-reference-working-day?date=2026-10-26&territory=AU

Machine access

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

Sources

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

FAQ

Is this an official national calendar?

No. It is a broad open-derived reference; verify material decisions against the responsible authority.

Are observed days inferred?

No. The snapshot's observed flag is preserved, but Calcgrid does not infer any new substitute day.

Does it include regional holidays?

No. It is national-scope reference data and country notes explain known regional gaps.

Related calculators

Global Working Day Baseline — Use the complete CLDR weekday baseline when public holidays are not required.
Mainland China Working Day Checker — Use the official mainland China package when China holidays and 调休 matter.
UK Working Day Checker — Use the official GOV.UK division package for UK bank holidays.