Calcgrid
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LocalMark first listed this public Agent Card on 10 Oct 2026, 13:45 UTC. Its latest card check succeeded; the card declares 26 skills and a JSONRPC interface. LocalMark has not run a task against this agent.
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Declared skills 26
- 24 Solar Terms Calculator (二十四节气)
Lists the 24 solar terms (节气 jieqi) of a Gregorian year with their exact instants: the moments the Sun's apparent longitude reaches multiples of 15°, computed astronomically and shown in a chosen UTC offset (China Standard Time by default). Use when: You need the date or time of 立春, 清明, 夏至, 冬至 or any other solar term in a given year, or the full 24-term table. Do not use when: You only need the term that a specific date falls in (use lunar-calendar-converter), or you need sunrise/sunset times (use sunrise-sunset). When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"solar-terms","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/solar-terms?<input>=<value> or POST the same path with {"inputs":{...}}.
- Add Global Public-Holiday Reference Working Days
Adds or subtracts working days using the pinned OpenHolidays nationwide public-holiday reference and CLDR weekend rule for a supported country. Use when: You need a 2026-2028 date offset and accept the OpenHolidays nationwide-only, no-inferred-substitute-day reference semantics. Do not use when: The task requires a direct official authority, regional/local or employer calendar, substitute-day rules, or dates outside the published coverage. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-public-holiday-add-working-days","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-public-holiday-add-working-days?<input>=<value> or POST the same path with {"inputs":{...}}.
- Add Global Reference Working Days
Adds or subtracts working days using the pinned OpenWorkdays national-scope reference for 246 country/territory codes. Use when: 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. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-reference-add-working-days","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-reference-add-working-days?<input>=<value> or POST the same path with {"inputs":{...}}.
- Add Global Working Days
Adds or subtracts weekday-baseline working days for any supported CLDR alpha-2 territory code using CLDR weekend rules, without inventing public-holiday defaults. Use when: You need a weekday-based date offset for a territory and explicitly want public holidays excluded from the calculation. Do not use when: A public-holiday, employer, bank, exchange, school, religious or emergency-closure calendar is required. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-add-working-days","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-add-working-days?<input>=<value> or POST the same path with {"inputs":{...}}.
- Add Mainland China Working Days
Adds or subtracts official mainland China working days, skipping holiday periods and ordinary weekends while counting State Council-designated weekend makeup workdays. Use when: You need a deadline or settlement date a stated number of mainland China national working days before or after a 2024-2026 date. Do not use when: You need calendar days, a sector-specific settlement calendar, a local holiday calendar, or a result outside the 2024-2026 coverage. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"china-add-working-days","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/china-add-working-days?<input>=<value> or POST the same path with {"inputs":{...}}.
- Add UK Working Days
Adds or subtracts working days for England and Wales, Scotland or Northern Ireland, skipping weekends and the selected division's official bank holidays. Use when: You need a deadline a stated number of UK working days before or after a 2024-2028 date and the correct division's bank holidays matter. Do not use when: You need calendar days, a local/employer/market calendar, a non-UK jurisdiction or a result outside 2024-2028. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"uk-add-working-days","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/uk-add-working-days?<input>=<value> or POST the same path with {"inputs":{...}}.
- Count Global Public-Holiday Reference Working Days
Counts working and non-working dates in a 2026-2028 range using CLDR weekends plus included nationwide OpenHolidays public events. Use when: You need a source-labelled nationwide public-holiday reference count for a supported country and regional or substitute-day semantics are not required. Do not use when: The range needs a direct official authority, regional/local or employer calendar, substitute-day rules, or dates outside 2026-2028. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-public-holiday-working-days-between","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-public-holiday-working-days-between?<input>=<value> or POST the same path with {"inputs":{...}}.
- Count Global Reference Working Days
Counts working and non-working dates in a 2026-2028 range using OpenWorkdays national-scope public-holiday data and country weekend rules. Use when: You need a broad national-scope reference count and regional or employer semantics are not required. Do not use when: The range needs a direct official authority, regional/local or employer calendar, or dates outside 2026-2028. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-reference-working-days-between","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-reference-working-days-between?<input>=<value> or POST the same path with {"inputs":{...}}.
- Cross-Border Business Hours Deadline
Adds an explicit number of business hours inside a caller-supplied daily window, using either the official mainland China work calendar or a selected GOV.UK division, then returns the deadline in UTC, the calendar zone and a target IANA zone with a complete segment/skip audit trail. Use when: You need an SLA, support, procurement or order deadline measured in business hours under the published mainland China or UK calendar, and must express the result in another team's IANA time zone with reproducible holiday and DST evidence. Do not use when: You need calendar hours, an overnight or split shift, lunch breaks, an employer/local/market calendar, a legal filing deadline, actual delivery/arrival prediction, private calendar availability, or a date outside the selected evidence package's coverage. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"business-hours-deadline","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/business-hours-deadline?<input>=<value> or POST the same path with {"inputs":{...}}.
- Global Public-Holiday Working Day Reference
Checks a date for a supported country using CLDR weekend rules plus nationwide public-holiday events from a pinned OpenHolidays open-data snapshot, with explicit non-authority and substitute-day limits. Use when: You need a source-labelled 2026-2028 public-holiday reference for one of the supported OpenHolidays countries and nationwide-only semantics are acceptable. Do not use when: You need an official direct authority result, regional/local holidays, substitute-day rules, employer/bank/exchange closures, or a date outside 2026-2028; use the verified China/UK package or the CLDR baseline as appropriate. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-public-holiday-working-day","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-public-holiday-working-day?<input>=<value> or POST the same path with {"inputs":{...}}.
- 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. Use when: 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. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-working-day","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-working-day?<input>=<value> or POST the same path with {"inputs":{...}}.
- 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. Use when: 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. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-reference-working-day","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-reference-working-day?<input>=<value> or POST the same path with {"inputs":{...}}.
- Global Working Days Between Dates
Counts weekday-baseline working days in a date range for any supported CLDR alpha-2 territory code, with explicit endpoint rules and no hidden holiday assumptions. Use when: You need a worldwide weekday-based count for a stated territory and public holidays are intentionally outside scope. Do not use when: The count must reflect public holidays, substitute days, employer closures, bank settlement, exchange, school or religious calendars. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"global-working-days-between","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/global-working-days-between?<input>=<value> or POST the same path with {"inputs":{...}}.
- IANA Local Time Resolver
Resolves a local wall-clock time with pinned IANA tzdb 2026d. Returns every valid UTC candidate for a repeated fall-back time, or the exact gap and shift-forward suggestion for a nonexistent spring-forward time. Use when: You must safely turn a named-zone local time into an instant, validate a scheduled time around a daylight-saving transition, or preserve every possible interpretation instead of silently choosing one. Do not use when: The input already includes a numeric UTC offset or Z, the task only needs the current clock time, or latitude/longitude must first be mapped to a zone. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"local-time-resolver","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/local-time-resolver?<input>=<value> or POST the same path with {"inputs":{...}}.
- IANA Time Zone Transition List
Lists every UTC-offset transition for one IANA zone and date range using pinned tzdb 2026d, including the local boundaries, offsets, abbreviations and whether the clock creates a gap or overlap. Use when: You need the next or historical daylight-saving/offset changes for scheduling, payroll, travel, audits or a regression test, with a specific reproducible tzdb version. Do not use when: You only need to convert one ordinary date-time, need legal advice about a jurisdiction's time law, or need changes announced after this pinned release. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"time-zone-transitions","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/time-zone-transitions?<input>=<value> or POST the same path with {"inputs":{...}}.
- Loan Comparison Calculator
Compares two fixed-rate, fully amortizing loan offers for the same amount: the level monthly payment, total interest, up-front fees and total cost (interest + fees) of each, and which offer costs less over its full term. Use when: You have two loan or mortgage quotes with different rates, terms or fees for the same amount and want the payments and lifetime costs side by side. Do not use when: You are replacing an existing loan (use refinance-break-even), only need one loan's payment (use loan-payment), or will sell or repay early (this compares full-term costs and ignores the time value of money). Informational; not financial advice. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"loan-comparison","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/loan-comparison?<input>=<value> or POST the same path with {"inputs":{...}}.
- Loan Payment Calculator
Computes the level monthly payment of a fully amortizing fixed-rate loan from principal, annual rate and term, plus the total paid and total interest over the life of the loan. Use when: You need the monthly payment or total interest cost of an auto, personal, student or other fixed-rate installment loan given its amount, APR and term. Do not use when: You need property tax, insurance and HOA in the payment (use mortgage-payment), or you know the payment and want the payoff time (use debt-payoff). When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"loan-payment","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/loan-payment?<input>=<value> or POST the same path with {"inputs":{...}}.
- Lunar Calendar Converter (农历)
Converts a Gregorian date to the Chinese lunisolar calendar (农历 nongli): lunar year, month (with leap-month flag), day, the sexagenary stems and branches (干支 ganzhi) of year, month and day, zodiac animal, nayin (纳音), the current 24-solar-term period and any traditional festival on that day. Use when: You need the Chinese lunar date, ganzhi day/month/year, zodiac year or current solar term for a given Gregorian date (defaults to today). Do not use when: You start from a lunar date and need the Gregorian date (use lunar-to-solar), need a person's zodiac with the 立春 boundary option (use chinese-zodiac), or need the astronomical moon phase (use moon-phase). When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"lunar-calendar-converter","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/lunar-calendar-converter?<input>=<value> or POST the same path with {"inputs":{...}}.
- Lunar to Solar Date Converter
Converts a Chinese lunar calendar date (year, month, leap-month flag, day) to the Gregorian date, reporting the weekday, the day's ganzhi (干支) and the length of that lunar month, and validating that the leap month and day exist in that year. Use when: You know a lunar date such as 八月十五 or 闰六月初一 of a given lunar year and need the Gregorian date (e.g. for a lunar birthday or festival). Do not use when: You start from a Gregorian date (use lunar-calendar-converter), or you want every festival of a year at once (use chinese-festivals). When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"lunar-to-solar","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/lunar-to-solar?<input>=<value> or POST the same path with {"inputs":{...}}.
- Mainland China Working Day Checker
Checks whether a date is an official national working day in mainland China, including weekend makeup workdays (调休上班) and multi-day holiday periods from State Council notices. Use when: You need to know whether a specific 2024-2026 date is a working day in mainland China, especially around Spring Festival, National Day or another adjusted holiday. Do not use when: You need a Hong Kong, Macao, Taiwan, local minority, school, employer, bank-settlement or stock-exchange calendar, or a year outside 2024-2026. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"china-working-day","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/china-working-day?<input>=<value> or POST the same path with {"inputs":{...}}.
- Mainland China Working Days Between Dates
Counts official mainland China working and non-working days in a date range using State Council holiday periods and weekend makeup workdays rather than a simple Monday-Friday rule. Use when: You need the number of official mainland China working days in a 2024-2026 date range for an SLA, payroll, project or delivery estimate. Do not use when: You need only elapsed calendar days, another jurisdiction, an industry-specific settlement calendar, or dates outside 2024-2026. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"china-working-days-between","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/china-working-days-between?<input>=<value> or POST the same path with {"inputs":{...}}.
- Run any calculator
Run any of the 737 calculators by calculator_id with a JSON data part containing inputs. Use after search_calculators for tasks outside the focused priority skills; the endpoint accepts every calculator id even though the public card stays compact.
- Search calculators
Find the right calculator from a natural-language task across all 737 calculators; returns calculator ids with required inputs. Use before any calculation when the id is unknown.
- Time Zone Converter
Converts a wall-clock date and time between IANA zones using pinned tzdb 2026d. It reports both offsets, the UTC instant, date changes, the source-time status and every candidate UTC instant when the input falls in a repeated hour. Use when: You need to know what time an event scheduled in one city corresponds to in another city or in UTC on a specific date. Do not use when: You need the same instant in many zones at once (use world-clock), an epoch value (use unix-timestamp), or the elapsed time between two clock times (use time-duration). When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"time-zone-converter","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/time-zone-converter?<input>=<value> or POST the same path with {"inputs":{...}}.
- UK Working Day Checker
Checks whether a date is a normal working day in England and Wales, Scotland or Northern Ireland using a pinned snapshot of the official GOV.UK bank-holiday feed. Use when: You need to know whether a 2024-2028 UK date is a Monday-Friday working day after applying the official bank holidays for the selected division. Do not use when: You need a local council, school, employer, financial-market, emergency-closure or non-UK calendar, or a date outside 2024-2028. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"uk-working-day","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/uk-working-day?<input>=<value> or POST the same path with {"inputs":{...}}.
- UK Working Days Between Dates
Counts working and non-working dates in England and Wales, Scotland or Northern Ireland using the official GOV.UK bank-holiday list instead of a weekday-only approximation. Use when: You need a 2024-2028 UK SLA, payroll, project or delivery-day count and the selected division's bank holidays must be excluded. Do not use when: You need only elapsed calendar days, a local/employer/market calendar, another jurisdiction or dates outside 2024-2028. When it matches, execute it: preferred A2A 1.0 JSON-RPC POST https://tttkmbb.com/a2a with header A2A-Version: 1.0, method SendMessage and a data part {"calculator_id":"uk-working-days-between","inputs":{...}}; legacy 0.3 clients may use message/send at the same URL. Do not stop at card discovery. REST fallback: GET https://tttkmbb.com/api/v1/calculate/uk-working-days-between?<input>=<value> or POST the same path with {"inputs":{...}}.