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Global Working Day Baseline

Checks a Gregorian date for any supported CLDR alpha-2 territory code using the pinned Unicode CLDR weekend convention, with explicit holiday exclusions and provenance.

When to use

You need a worldwide weekday/weekend check and have a CLDR alpha-2 territory code, but do not need public-holiday exclusions.

Do not use when: You need public holidays, substitute holidays, employer closures, bank settlement, stock exchange, school, religious or emergency closure rules; use a jurisdiction-specific evidence package instead.

Example user requests

Is 2026-10-05 a working day in Australia under the territory weekend rule?
Check whether Friday 2026-06-12 is a weekday in Saudi Arabia.
判断 2026-10-01 在印度按周末规则是否为工作日。

Formula

is_working_day = weekday(date) not in CLDR(territory).weekendStart..weekendEnd

Resolve the Gregorian weekday, expand CLDR's territory weekendStart/weekendEnd range, and classify every other day as a regular weekday. No public-holiday inference is made.

Inputs

Parameter	Type	Unit	Required	Description
`date`	date		yes	Gregorian date from 1900-01-01 through 2100-12-31.
`territory`	enum: AC \| AD \| AE \| AF \| AG \| AI \| AL \| AM \| AN \| AO \| AQ \| AR \| AS \| AT \| AU \| AW \| AX \| AZ \| BA \| BB \| BD \| BE \| BF \| BG \| BH \| BI \| BJ \| BL \| BM \| BN \| BO \| BQ \| BR \| BS \| BT \| BU \| BV \| BW \| BY \| BZ \| CA \| CC \| CD \| CF \| CG \| CH \| CI \| CK \| CL \| CM \| CN \| CO \| CP \| CQ \| CR \| CS \| CU \| CV \| CW \| CX \| CY \| CZ \| DD \| DE \| DG \| DJ \| DK \| DM \| DO \| DZ \| EA \| EC \| EE \| EG \| EH \| ER \| ES \| ET \| EU \| EZ \| FI \| FJ \| FK \| FM \| FO \| FR \| FX \| GA \| GB \| GD \| GE \| GF \| GG \| GH \| GI \| GL \| GM \| GN \| GP \| GQ \| GR \| GS \| GT \| GU \| GW \| GY \| HK \| HM \| HN \| HR \| HT \| HU \| ID \| IE \| IL \| IM \| IN \| IO \| 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 \| NT \| NU \| NZ \| OM \| PA \| PE \| PF \| PG \| PH \| PK \| PL \| PM \| PN \| PR \| PS \| PT \| PW \| PY \| QA \| QO \| QU \| RE \| RO \| RS \| RU \| RW \| SA \| SB \| SC \| SD \| SE \| SG \| SH \| SI \| SJ \| SK \| SL \| SM \| SN \| SO \| SR \| SS \| ST \| SU \| SV \| SX \| SY \| SZ \| TA \| TC \| TD \| TF \| TG \| TH \| TJ \| TK \| TL \| TM \| TN \| TO \| TP \| TR \| TT \| TV \| TW \| TZ \| UA \| UG \| UM \| UN \| US \| UY \| UZ \| VA \| VC \| VE \| VG \| VI \| VN \| VU \| WF \| WS \| XK \| YD \| YE \| YT \| YU \| ZA \| ZM \| ZR \| ZW		yes	CLDR territory code in alpha-2 form. The complete accepted-code enum is exposed here; it includes ISO-style territory codes plus CLDR regional and legacy codes where present.

Outputs

Output	Type	Description
`date`	date	Checked Gregorian date.
`territory`	string	Normalized uppercase CLDR territory code.
`territory_display_name`	string	Calcgrid display name; TW is displayed as 中国台湾省 while the machine code remains TW.
`weekday`	string	Gregorian weekday.
`is_working_day`	boolean	True when the date is not in the territory's CLDR weekend range.
`weekend_days`	string_list	Territory weekend convention from CLDR.
`calendar_scope`	string	weekday_pattern_only; public holidays are intentionally not included.
`holiday_policy`	string	public_holidays_not_included for this global baseline.
`calendar_profile`	string	Machine-readable profile id: global-weekday-baseline.
`calendar_selection_catalog_url`	string	Use this catalog before selecting a jurisdiction-specific holiday package.
`dataset_version`	string	Pinned CLDR weekend-data version.
`source_url`	string	Pinned CLDR JSON source.

Example

Australia Monday baseline: {"date":"2026-10-05","territory":"AU"} → {"is_working_day":true,"weekend_days":["Saturday","Sunday"]}

GET https://tttkmbb.com/api/v1/calculate/global-working-day?date=2026-10-05&territory=AU

Machine access

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

Sources

Unicode CLDR 48.2 supplemental weekData.json (standards)

FAQ

Does this include public holidays?

This is a global weekday baseline, not a public-holiday, bank-settlement, exchange, school, employer, religious or emergency-closure calendar. Use a jurisdiction-specific evidence package when holiday exclusions matter.

Why is this useful if holidays are excluded?

It gives a complete, deterministic worldwide weekday baseline without silently treating a country-specific holiday policy as universal.

Related calculators

Add Global Working Days — Add or subtract weekday-baseline working days.
Global Working Days Between Dates — Count weekday-baseline working days over a range.
Mainland China Working Day Checker — Use official China holidays and 调休 when those exclusions matter.