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Mart402 Japan Business Days & Statutory Deadlines
x402
Mart402 Japan Business Days & Statutory Deadlines is a paid API for AI agents from mart402.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-01).
Calculates Japanese business days, public holidays (including equinox and substitute holidays), business-day arithmetic, tax filing deadlines with holiday shifts, and wareki (Japanese era) conversions for dates between 1980 and 2099.
Price / call$0.003
Success—
StatusUnknown
How this service works
Japan business days + statutory deadlines: holidays (equinox + substitute), business-day arithmetic, tax filing deadlines with holiday shift, wareki conversion. 1980-2099. $0.003/call.
Output
Returns whether a date is a Japanese business day or holiday (including equinox and substitute holidays), the result of business-day arithmetic (e.g. next/previous business day, N-day offset), tax filing deadlines adjusted for holiday shifts, and wareki-format date representations. Coverage spans 1980–2099.
Example use cases
Tax deadline shift for Japan filing
“Our corporate tax return is due on September 23, 2025 in Japan — is that a public holiday, and if so, what is the actual filing deadline after the holiday shift?”
Business-day countdown for contract terms
“A supplier contract requires payment 15 business days after the invoice date of January 6, 2026 in Japan — what is the exact due date accounting for Japanese public holidays?”
Wareki date conversion for legal documents
“Convert February 11, 2026 to its wareki (Japanese era) equivalent so I can fill in a Japanese legal document correctly.”
Technical details
Endpoint
POSThttps://mart402.com/v1/jp-business-days?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative Japanese business calendar logic — especially equinox holidays (whose dates vary by year), substitute holidays, statutory tax deadline shifts, or wareki conversions — rather than relying on a generic calendar library that may not have current Japanese holiday rules or era names. Covers 1980–2099 with statutory accuracy.
Side effects
- Date outside 1980–2099 range returns an error or out-of-range response
- Invalid date format (non-ISO string) causes a validation error
- Unsupported 'kind' or 'mode' enum value returns a bad-request error
- Missing required fields (e.g. base_date) return a 400-class error
- Network or payment authorization failure (x402 protocol) prevents call execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| kind | string | |
| mode | string | |
| base_date | string |
Tags
x402
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