MCP server

Japan & World Public Holidays

dev.omikuji/holiday

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

Public holidays, business days and long weekends for Japan (Cabinet Office) and 245 other countries.

Working at last checkVerified publisher: omikuji.devAbout 1,398 tokens per request once connected4 tools

https://holiday.omikuji.dev/mcp

At a glance

Type: MCP server
Publisher: omikuji.dev (verified by the MCP Registry)
Status: Working at last check
Tools: 4
Token cost: About 1,398 tokens per request
Sets up in: Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok
Last checked: 26 Oct 2026, 08:29 UTC

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

claude mcp add --transport http holiday https://holiday.omikuji.dev/mcp

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

[mcp_servers.holiday]
url = "https://holiday.omikuji.dev/mcp"

Gemini CLI

{"mcpServers":{"holiday":{"httpUrl":"https://holiday.omikuji.dev/mcp"}}}

Cursor

{"mcpServers":{"holiday":{"url":"https://holiday.omikuji.dev/mcp"}}}

VS Code

{"servers":{"holiday":{"type":"http","url":"https://holiday.omikuji.dev/mcp"}}}

Antigravity

agy mcp add holiday https://holiday.omikuji.dev/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"holiday","server_url":"https://holiday.omikuji.dev/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"holiday","server_url":"https://holiday.omikuji.dev/mcp"}

business_days ~398 tokens
Count business days between start and end (inclusive), or find the date that is N business days after start (add=N; negative N goes backward; start itself is not counted). Business day = weekday that is not a national holiday. Set year_end_closed to also skip 12/29-1/3. With country, uses that count
check_dates ~345 tokens
For each date, tell whether it is a Japanese national holiday (with name and kind: 祝日 / 振替休日 / 国民の休日), a weekend, and a business day. Also returns today in Japan time. With country, the same for that country (holiday names, status, make-up workdays such as China's 调休).
find_long_weekends ~329 tokens
Find 連休 (3+ consecutive days off made of weekends and national holidays), e.g. Golden Week, Silver Week. Give a year, or from (default today) to list upcoming ones. With country, the same for that country.
list_holidays ~326 tokens
List Japanese national holidays for a year, or between from and to. With no arguments, lists the next 10 holidays from today (Japan time). With country, lists that country's public holidays (and make-up workdays, if any).

Japan Business Day
Japan business days & holidays (official Cabinet Office data). Free tool + x402 USDC paid tools.
Japan Public Ledgers MCP
Tamper-evident daily ledgers of 12 Japanese public-data domains, with cross-ledger entity search.
Japan Business Tools
Japanese holidays, business days, eras, postal codes, addresses and corporate numbers.
Calcgrid
China working-day data, UK bank holidays, IANA time zones and deterministic business deadlines.
BridgeDays
Plan annual leave around public holidays: bridge days and long weekends for 200+ countries.
Reference Data
Asian govt data, cited to source: rates, VAT, tax, wages, holidays, FX. 28 countries; Japan free.
Kitbench
Exact Japanese text & date tools: char count, business days with JP holidays, era, tax, units.
WorkdayAPI
Business-day and public-holiday math for 29 countries: add business days, days between, holidays.

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