lilambd Calendar Converter

x402

lilambd Calendar Converter is a paid API for AI agents from api.lilambd.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-11-04).

Converts a date into multiple calendar systems simultaneously, including Gregorian, Coptic, Julian, Ethiopic, Hebrew, Chinese, Persian, Hijri, Buddhist, Japanese era, and more

Price / call$0.005

Seller volume →—

Success—

StatusUnknown

How this service works

A crossing for play, feeling, language, science and computation — creating states that do not have names yet.

Output

A JSON object containing the input date expressed in over ten calendar systems (Gregorian, Julian, Coptic, Ethiopic, Hebrew, Chinese, Persian, Hijri Umm al-Qura, Buddhist, ROC, Japanese era), plus the Julian Day Number, ISO weekday number, weekday name, solar term (with English name), and a list of festivals with country-count metadata, along with an attribution string.

Example use cases

Multi-calendar date reference for a cultural app

“My app needs to display today's date — March 20, 2026 — in the Hebrew, Islamic Hijri, Coptic, and Chinese calendars all at once. Can you fetch the conversions?”

Historical research date cross-referencing

“I'm researching an event recorded as March 7, 2026 in the Julian calendar — what does that correspond to in the Gregorian, Ethiopic, and Persian calendars, and what is the Julian Day Number?”

Festival and solar term lookup for a given day

“What international festivals and solar terms fall on March 20, 2026, and how many countries share that date's observance?”

Technical details

Endpoint

GEThttps://api.lilambd.com/calendars/convert?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a date converted into multiple calendar systems in a single call, especially when you need rare or non-Western calendars (Coptic, Ethiopic, Julian, Japanese era, ROC) alongside common ones (Hebrew, Hijri, Chinese, Persian). It is preferable over individual calendar conversion APIs because it returns all systems simultaneously, includes festival metadata and solar term annotations, and operates at low per-call cost via x402 micropayment.

Side effects

Invalid or unparseable date input returns an error response
Missing required date parameter results in a 400-level error
Dates outside the supported historical range may return incomplete or null calendar fields
Network or payment-related failures (x402 payment not completed) result in a 402 Payment Required response

Input

Schema · Request body

Field	Type	Description
required	string
properties	string
additionalProperties	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "data": {
      "jdn": 2461120,
      "coptic": "1742-07-11",
      "julian": "2026-03-07",
      "ethiopic": "2018-07-11",
      "roc_year": 115,
      "festivals": [
        {
          "festival_id": "...",
          "n_countries_same_date": 68
        }
      ],
      "gregorian": "2026-03-20",
      "solar_term": {
        "name_en": "..."
      },
      "iso_weekday": 5,
      "japanese_era": {
        "year": 8,
        "era_code": "reiwa"
      },
      "weekday_name": "...",
      "buddhist_year": 2569,
      "table_calendars": {
        "hebrew": "...",
        "chinese": "...",
        "persian": "...",
        "hijri_umalqura": "..."
      }
    },
    "attribution": "..."
  }
}

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