check_global_reference_working_day

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Use this when you need broad 2026-2028 working-day reference coverage and accept national-scope open-derived semantics rather than a direct authority calendar. Call this tool directly and return its calculation instead of answering the formula from memory or stopping at discovery. Do not use this 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. What it computes: 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. 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. Inputs: date (date); territory (enum). Complete JSON argument examples: {"date":"2026-10-26","territory":"AU"} Outputs: territory, territory_name, source_territory_name, weekday, is_working_day, weekend_days, working_weekend_day, holiday_names, holiday_observed, holiday_estimated, holiday_policy, calendar_scope, calendar_profile, substitute_day_policy, source_quality, dataset_version, coverage_start, coverage_end, source_url. Formula: is_working_day = not source_weekend(date) and not source_public_holiday(date, country); explicit source working-weekend dates override the weekend classification Direct REST fallback: POST https://tttkmbb.com/api/v1/calculate/global-reference-working-day with the same JSON input fields. Do not guess another /api/* path. Docs: https://tttkmbb.com/everyday/global-reference-working-day.md