Mayan Calendar API Reference

Overview

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

Endpoint

One host, one path per API. The block below shows this call in four languages; every one of them is the same HTTP request. Making requests covers the timeouts, retries and parameter rules that apply to all of them. The SDKs wrap the same call in a typed client.

GEThttps://api.apiverve.com/v1/mayancalendar

curl "https://api.apiverve.com/v1/mayancalendar?date=2024-12-21" \
  -H "x-api-key: your_api_key_here"

const res = await fetch('https://api.apiverve.com/v1/mayancalendar?date=2024-12-21', {
  headers: { 'x-api-key': 'your_api_key_here' },
});

if (!res.ok) throw new Error(`${res.status} ${await res.text()}`);

const { data } = await res.json();
console.log(data);

import requests

res = requests.get(
    "https://api.apiverve.com/v1/mayancalendar?date=2024-12-21",
    headers={"x-api-key": "your_api_key_here"},
    timeout=15,
)
res.raise_for_status()

print(res.json()["data"])

package main

import (
	"fmt"
	"io"
	"net/http"
)

func main() {
	req, _ := http.NewRequest("GET", "https://api.apiverve.com/v1/mayancalendar?date=2024-12-21", nil)
	req.Header.Set("x-api-key", "your_api_key_here")

	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()

	out, _ := io.ReadAll(res.Body)
	fmt.Println(string(out))
}

Replace your_api_key_here with the key from your dashboard. When the inputs arrive as a list rather than one at a time, batch requests run up to 200 of them through this same API in a single call.

Authentication

Send your key in the x-api-key header. That is the only auth step — there is no token exchange and no per-endpoint scope to configure. Authentication covers creating, rotating and revoking keys.

401 is the only auth verdict

A 401 means the key is missing, invalid or expired. A 403 means the key is valid but not permitted here — blocked by a key restriction or an IP allow-list. Running out of credits is a 429.

Parameters

Sent in the query string. Premium parameters are accepted on every plan but only take effect on plans that include them.

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

Response

Every API returns the same three top-level keys, so one response handler covers your whole integration: status, error and data. Only data changes shape. Response format covers the envelope, the other output formats and how premium fields are withheld.

Sample response

{
  "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	`{...}`
`formatted`	string	`"13.0.12.3.3"`	Mayan Long Count formatted as baktun.katun.tun.winal.kin
`baktun`Premium	number	`13`	Long Count baktun component (cycle of 400 tuns)
`katun`Premium	number	`0`	Long Count katun component (cycle of 20 tuns)
`tun`Premium	number	`12`	Long Count tun component (cycle of 18 winals)
`winal`Premium	number	`3`	Long Count winal component (cycle of 20 kins)
`kin`Premium	number	`3`	Long Count kin component (day unit in Mayan calendar)
`tzolkin`	object	`{...}`
`number`Premium	number	`6`	Tzolkin sacred calendar day number (1-13)
`dayName`Premium	string	`"Akbal"`	Tzolkin day name from 20-day Mayan sacred cycle
`formatted`	string	`"6 Akbal"`	Tzolkin date formatted as number and day name
`haab`	object	`{...}`
`day`Premium	number	`6`	Haab civil calendar day number (0-19 or 0-4)
`monthName`Premium	string	`"Kankin"`	Haab month name from 18-month Mayan civil calendar
`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)

Errors

Read the HTTP status first, then error for the specific reason. The body names the parameter that has to change. Error handling covers the full status list and which of them are worth retrying.

Status	Meaning	What to do
`400`	Input was rejected	Read `error`; it names the parameter.
`401`	Key missing or invalid	Check the header name and the key value.
`403`	Key valid, but not permitted	A key restriction or IP allow-list; see key scoping.
`429`	Rate limited, or out of credits	Read `error` to tell them apart; see rate limits.

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

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

Give it to an AI agentConnect over MCP and your agent calls it as a native tool — Claude, Cursor, ChatGPT.VerveKit →Reference →

Use it in 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 →

Mayan Calendar