PlugRail Japanese Calendar
Check Japanese holidays and calculate business days for payroll, invoicing and scheduling.
Calculates Japanese holidays and business days using official Japan Cabinet Office data. Helps with payroll deadlines, invoice due dates, and scheduling by excluding weekends, national holidays, and optional banking closures.
Try asking Muse: "How many business days until my invoice is due on July 20th, excluding weekends and Japanese holidays?"
Source: Found in the official MCP Registry (dev.plugrail/jp-calendar) · First listed September 24, 2026
Last 24 hours
Each bar is one check, every 15 minutes. Green means it answered. Last checked 24 min ago.
Is it safe to connect?
What Muse can see: It does not ask you to sign in, so it cannot see your accounts. It only sees what Muse sends it from your request.
Before it acts: Read what Muse plans to do before you approve it, and remove the app from Muse when you stop using it.
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How to add it to Muse
Not in Muse's Connectors list yet, but Muse can still use it. Copy the request below and paste it into Muse. Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
https://jp-calendar.plugrail.dev/mcpNot in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
Technical details: safety screening, tools, response time and recent checks
Response time at the last check: 993ms. Worked in 100% of checks over 30 days.
Screening · September 24, 2026
Screened, no issues found
Screening looks for known threats and hidden instructions at the time of the check, and runs again weekly and whenever the tool list changes. It cannot see the server's code, so only connect what you need and review what Muse asks to do. How screening works.
Tools · 4
is_holiday指定した日付が日本の祝日（国民の祝日・休日）かどうかを判定します。内閣府公表データに基づきます。入力例: {"date": "2026-01-01"}list_holidays指定した年または期間の日本の祝日一覧を返します。入力例: {"year": 2026} または {"from": "2026-01-01", "to": "2026-06-30"}add_business_days指定した日付(date)の翌日から数えてN営業日目(days)の日付を返します。dateの当日は数えません。daysが負の場合は過去方向（dateの前日から遡ってN営業日目）に計算します。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。dateが営業日かどうかだけ知りたい場合は is_holiday を使ってください（days=0でも同じ情報がskipped経由で得られます）。入力例: {"date": "2026-07-10", "days": 3}business_days_betweenfrom〜to間の営業日数を数えます。既定では「fromを含まず、toを含む」境界です（例:「今日から支払期日まで何営業日か」）。include_from/include_toで境界を変更できます。土日・日本の祝日を除外し、calendar="banking"を指定すると銀行休業日（12/31〜1/3）も除外します。from > to の場合はエラーにせず、from/toとinclude_from/include_toを入れ替えて計算した結果の符号を反転した値（負の営業日数）を返します（反対称則: count(A,B,x,y) = -count(B,A,Recent checks
Link
https://jp-calendar.plugrail.dev/mcpQuestions about PlugRail Japanese Calendar in Muse
How do I connect PlugRail Japanese Calendar to Muse?
Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use PlugRail Japanese Calendar to help me. It is a free service with an MCP server at https://jp-calendar.plugrail.dev/mcp. It does not need an API key. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.
Is PlugRail Japanese Calendar working right now?
At the last check (September 28, 2026, 08:45 UTC) the endpoint was working, answering in 993ms. Over the last 7 days it answered 100% of health checks. It is checked every 15 minutes.
Is PlugRail Japanese Calendar safe to connect to Muse?
It was screened on September 24, 2026 with the result "screened, no issues found". Screening checks the domain against threat feeds and reads the tools for hidden instructions and requests for passwords or card numbers. It cannot see the server's code, so grant only the access you need.
What can PlugRail Japanese Calendar do in Muse?
It exposes 4 tools, including is_holiday, list_holidays, add_business_days, business_days_between. For example, you could ask Muse: "How many business days until my invoice is due on July 20th, excluding weekends and Japanese holidays?"
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