Mayan Calendar Skill

Overview

Uses the GMT (Goodman-Martinez-Thompson) correlation constant for accurate conversion. Ideal for educational content, historical research, and cultural applications.

Live Test Mayan Calendar Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as MayanCalendarSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

Tool call

{
  "name": "MayanCalendarSkill",
  "arguments": {
    "date": "2024-12-21"
  }
}

You do not name the tool yourself; the model picks it. Asking about 2024-12-21 in the terms this skill covers is enough for it to reach for MayanCalendarSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

Argument	Type	Description
`date`Required	string	The Gregorian date in YYYY-MM-DD format date

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

Result

{
  "status": "ok",
  "error": null,
  "data": {
    "gregorian": "2024-12-21",
    "longCount": {
      "formatted": "13.0.12.3.3",
      "baktun": 13,
      "katun": 0,
      "tun": 12,
      "winal": 3,
      "kin": 3
    },
    "tzolkin": {
      "number": 6,
      "dayName": "Akbal",
      "formatted": "6 Akbal"
    },
    "haab": {
      "day": 6,
      "monthName": "Kankin",
      "formatted": "6 Kankin"
    },
    "calendarRound": "6 Akbal 6 Kankin",
    "daysSinceEpoch": 1876383
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Field	Type	Example	Description
`gregorian`	string	`2024-12-21`	The input Gregorian date in YYYY-MM-DD format
`longCount`	object	`{…}`
`longCount.formatted`	string	`13.0.12.3.3`	Mayan Long Count formatted as baktun.katun.tun.winal.kin
`longCount.baktun`Premium	number	`13`	Long Count baktun component (cycle of 400 tuns)
`longCount.katun`Premium	number	`0`	Long Count katun component (cycle of 20 tuns)
`longCount.tun`Premium	number	`12`	Long Count tun component (cycle of 18 winals)
`longCount.winal`Premium	number	`3`	Long Count winal component (cycle of 20 kins)
`longCount.kin`Premium	number	`3`	Long Count kin component (day unit in Mayan calendar)
`tzolkin`	object	`{…}`
`tzolkin.number`Premium	number	`6`	Tzolkin sacred calendar day number (1-13)
`tzolkin.dayName`Premium	string	`Akbal`	Tzolkin day name from 20-day Mayan sacred cycle
`tzolkin.formatted`	string	`6 Akbal`	Tzolkin date formatted as number and day name
`haab`	object	`{…}`
`haab.day`Premium	number	`6`	Haab civil calendar day number (0-19 or 0-4)
`haab.monthName`Premium	string	`Kankin`	Haab month name from 18-month Mayan civil calendar
`haab.formatted`	string	`6 Kankin`	Haab date formatted as day and month name
`calendarRound`Premium	string	`6 Akbal 6 Kankin`	Calendar Round combining Tzolkin and Haab dates
`daysSinceEpoch`Premium	number	`1876383`	Days since Mayan creation date (0.0.0.0.0)

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

Status	What it means
`400` / `422`	The arguments did not validate. The message names the offending one.
`401`	The OAuth session is invalid or expired — reconnect the server.
`403`	Blocked by a key restriction or an IP allow-list. Never a bad identity.
`404`	This skill is not part of VerveKit. Check the catalog.
`429`	Out of credits, or a brief rate limit. The message tells them apart.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Educational Tools: Teach about ancient Mesoamerican calendar systems
Cultural Applications: Display Mayan dates for heritage and cultural apps
Historical Research: Convert dates for archaeological and historical study
Novelty Apps: Generate personalized Mayan birth dates

Other ways to use Mayan Calendar Skill

Set up Mayan Calendar Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

Call it as a REST APIOne HTTPS endpoint and an x-api-key header, with SDKs for Node, Python and .NET.APIVerve →Reference →

Google Sheets or ExcelA =VERVE() formula fills a column — no script, no export, recalculates in place.VerveSheets →Reference →

Ground an agent on itA cited, machine-checkable fact your model can't produce on its own.VerveContext →Reference →