Icyn Date

Name: Icyn Date
Author: icyn12-tinker

by icyn12-tinkerversion 0.1.5i★ –iRuns on your computer

Registry nameio.github.icyn12-tinker/icyn-date

Install

Overview

Description from the maker (original English)

Date context for agents: Chinese lunar calendar, solar terms, holidays for 12 regions. Offline.

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These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiNot measured yet★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Docs, sheets & office work

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

npmNode.js installed (for the npx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "icyn-date": {
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add icyn-date -- npx -y @icyn/date-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "icyn-date": {
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "icyn-date": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@icyn/date-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account icyn12-tinker, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Docs, sheets & office worki

More stars than 0% of the other 2167 servers in this category
Published to the registry more recently than 41% of the other 2167 servers in this category
Basic checks equal to or better than 100% of the other 2167 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Icyn Date safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.5) reached the registry 2 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Agent-Native Calendar, Excel MCP Server, MCP Server for Excel

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

icyndate

Date context for AI agents and developers: lunar calendar, solar terms, holidays and "what does this day mean" — offline, verified, MIT. 给 AI Agent 和开发者的日期语义层：农历、节气、节假日、"这一天意味着什么"——离线、可验证、MIT。

Status: week 1. Lunar calendar, the 24 solar terms and the holiday layer (12 regions) are in;

lunar & solar terms verified for 1900–2100, CN holidays for 2024–2026.

状态：第一周。农历、二十四节气、节假日层（12 个地区）均已落地；农历与节气 1900–2100 全量验证，

中国大陆节假日 2024–2026 逐天对拍。

Install / 安装

npm i @icyn/date                       # library: lunar + solar terms + CN holidays (~90 KB)

import "@icyn/date/regions/all"; # opt in to the other 11 regions (+ subdivisions), or "@icyn/date/regions/JP"

npx -y @icyn/date-mcp # MCP server for Claude Desktop / Cursor / any MCP client

What works today / 现在能用的

One call:

import { dateContext } from "@icyn/date";

dateContext("2026-02-17", { region: "CN" }); // { // date: "2026-02-17", region: "CN", // civil: { weekday: 2, isoWeek: 8, isoWeekYear: 2026, dayOfYear: 48, leapYear: false }, // workday: { available: true, kind: "public_holiday", isWorkday: false, confidence: "certain", source: "official", // holiday: { id: "spring-festival", festival: "lunar-new-year", name: { "zh-Hans": "春节", en: "Chinese New Year" }, dayIndex: 3, span: 9 }, // meta: { region: "CN", data_version: "2026.09.18", verified_until: 2026, … } }, // lunar: { year: 2026, month: 1, day: 1, yearGanZhi: "丙午", zodiac: "马", monthName: "正月", dayName: "初一", … }, // solarTerm:{ onThisDay: null, current: { name: { zh: "立春", en: "Beginning of Spring" }, at: "2026-02-03T20:01:51.000Z" }, next: { zh: "雨水", … } } // }

Dates can be given as "2026-02-17", [2026, 2, 17], { year, month, day } or a Date (UTC fields). Every holiday answer carries source (official / baseline / predicted), confidence (certain / likely / uncertain) and data version metadata; a year we know nothing about comes back as { available: false, reason }, never a guess.

Pieces:

import { solarToLunar, lunarToSolar } from "@icyn/date";

solarToLunar("2026-02-17"); // { year: 2026, month: 1, day: 1, leap: false, yearGanZhi: "丙午", dayGanZhi: "…", // zodiac: "马", monthName: "正月", dayName: "初一", isLeapYear: false, monthLength: 30 }

lunarToSolar({ year: 2033, month: 11, day: 1, leap: true }); // [2033, 12, 22]

import { solarTerms, solarTermAt, solarTermOnDay } from "@icyn/date"; solarTermOnDay("2026-02-04"); // { name: { zh: "立春", en: "Beginning of Spring" }, at: 2026-02-03T20:01:51Z, … } solarTermAt(new Date()); // { current, next } with exact instants solarTerms(2027); // all 24 of the year

import { dayInfo, nextWorkday, workdaysBetween, holidays } from "@icyn/date"; dayInfo("2026-02-14", "CN"); // { kind: "adjusted_workday", isWorkday: true, source: "official", confidence: "certain", … } dayInfo("2027-02-13", "CN"); // { kind: "weekend", source: "predicted", confidence: "uncertain", note: "Within the usual 调休 window…" } regionsObserving("lunar-new-year", 2026); // [{ region: "HK", days: [...] }, { region: "KR", … }, …] dayInfo("2026-01-06", "DE-BY"); // Heilige Drei Könige — subdivision holiday, resolvedRegion "DE-BY" nextLongWeekend("CN", "2026-09-18", 7); // { start: "2026-10-01", end: "2026-10-07", days: 7 } nextLunarDate(8, 15, "2026-09-18"); // next 中秋: { date: "2026-09-25", lunarYear: 2026, adjusted: false } describe("2026-02-17", { region: "CN" }); // "2026-02-17 星期二，农历丙午马年正月初一，CN 放假：春节（第 3/9 天）。" nextWorkday("CN", "2026-09-30"); // "2026-10-08" workdaysBetween("CN", "2026-02-13", "2026-02-24");

Solar ⇄ lunar for every day 1900-01-31 .. 2100-12-31 (MAX_DATE; that last date falls inside lunar 2100 腊月, so monthLength for that month is null — the table ends mid-month and the real length is unknown)
Year / day 干支, zodiac, Chinese month & day names, leap month handling (incl. the 2033 閏冬月 case)
24 solar terms as exact instants (second precision), current/next lookup, "is there a term on this day" at any UTC offset
Workday / holiday queries for 12 regions, every answer tagged official / baseline / predicted — never silently guessed
Zero dependencies, no runtime astronomy; ~480 KB of table data, of which only the lunar/solar-term tables and CN are in the default entry point — the other 11 regions and their 70+ subdivisions load only if you import them

Error model / 失败行为

Functions that return an info object (dayInfo, dateContext, holidays) never throw for missing data: they return { available: false, reason } or an empty list.
Functions that return a scalar (isWorkday, addWorkdays, nextWorkday, workdayCount) throw RangeError when the region-year is not covered.
Search functions (nextLongWeekend, nextLunarDate) return null when nothing is found in range, and throw when data runs out.
Bad input (unknown region, malformed date, 2 月 30 日) always throws TypeError / RangeError. Region codes are case-insensitive ("us-ca" = "US-CA"); a code with no data at all still throws.
Prediction is forward-only. A year we have not entered is extrapolated only if it is *after* the last entered year (coverage(region).predictedFrom). Past uncovered years return { available: false } rather than a guess — extrapolating the current 《放假办法》 backwards would invent history (清明/端午/中秋 became statutory only in 2008, 春节 runs 除夕..初三 only from 2025).

How it is verified / 验证方式

tools/gen_fixtures.py and tools/gen_solar_terms.py generate fixtures/lunar-1900-2100.json (73,384 rows) from two independent reference implementations (sxtwl, lunar_python). The test suite converts every row in both directions. Anything the two references disagree on is written to fixtures/lunar-disagreements.json and adjudicated by hand (see NOTES.md). A release is blocked unless 100% of rows pass.

npm install

npm test # Node only

the full release gate: build + tsc + tests + the CN cross-check

python3 -m pip install -r tools/requirements.txt # one pure-Python package npm run check

The last step of npm run check verifies CN.json day-by-day against chinesecalendar. If that package is missing it fails loudly rather than skipping — an unverified table must not look like a passing gate.

Roadmap / 路线图

Lunar core + 1900–2100 fixtures
24 solar terms with exact instants (two references agree within 55 s; spot-check against 紫金山天文台 published values before release)
Holidays CN 2024–2026 official (incl. 调休), cross-checked day-by-day with chinesecalendar; later years → statutory days predicted from lunar/solar-term rules (forward-only; earlier years are never guessed)
Holidays HK/MO/TW/JP/KR/VN/SG/US/GB/DE/FR 2024–2028 as baseline (python-holidays rules), CNY dates cross-checked against our lunar table
Region time zones (DST-aware via Intl) so JP/KR/EU decide solar-term days in their own zone; region hierarchy (US-CA, DE-BY, GB-SCT, 70+ subdivisions as diffs); holiday kind (public/federal/bank/substitute); previousWorkday / addWorkdays / workdayCount / holidaysBetween / isHolidayEve / nextLongWeekend; month & hour 干支, nextLunarDate (lunar birthdays); describe() one-sentence zh/en output for MCP
dateContext() one-call API, canonical date input, confidence levels, BCP-47 names with guaranteed en + zh-Hans, canonical festival ids across regions, data version metadata, graceful available: false
Upgrade baseline regions to official year by year against gazettes (TW 補班, HK gazette, KR substitute days first)
"On this day" from Wikipedia (CC BY-SA, attributed per entry)
@icyn/date npm package (esbuild ESM, per-region entry points, d.ts) · @icyn/date-mcp MCP server (11 tools, stdio, smoke-tested end to end)
icyndate pip package (same test vectors)
Hosted API

Repository layout / 目录

docs/        product & technical plan（产品与技术方案）, worklog

fixtures/ reference test vectors (generated, committed) tools/ fixture generators (Python, not shipped) packages/core/ @icyn/date — the library packages/mcp/ @icyn/date-mcp — MCP server

License

MIT for code and the derived lunar / solar-term tables. The baseline holiday tables for the eleven non-CN regions are derived from python-holidays (MIT) — its licence is reproduced in THIRD-PARTY-LICENSES, and each generated file records the exact version in baseline_note. Other third-party data (Wikipedia, government holiday notices) keeps its own licence and is attributed per entry.

Icyn Date

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Docs, sheets & office worki

Common questions

Alternatives

Agent-Native Calendar

Excel MCP Server

MCP Server for Excel

README from the maker

icyndate

Install / 安装

What works today / 现在能用的

Error model / 失败行为

How it is verified / 验证方式

the full release gate: build + tsc + tests + the CN cross-check

Roadmap / 路线图

Repository layout / 目录

License