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x402 Utils – Date Arithmetic & Difference Calculator
x402
x402 Utils – Date Arithmetic & Difference Calculator is a paid API for AI agents from utils.kagurazaka.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-30).
Add or subtract ISO 8601 durations to a date, or compute the difference between two dates in days, weeks, months, years, seconds, and business days (with country-specific public holidays).
Price / call$0.001
Success—
StatusUnknown
How this service works
Add or subtract an ISO 8601 duration (P1M, P2W, PT36H) to a date, months clamped to the month's end; or count the days, weeks, calendar months, years, seconds and business days (Monday to Friday, less a country's public holidays) between two dates. Also the weekday, ISO week and day of year.
Output
A JSON object with a 'start' section (date string, weekday name, ISO week number, and day of year) and optionally a 'between' section (days, weeks, months, years, seconds, and business days between the start and end dates).
Example use cases
Project deadline date calculation
“Our contract starts on 2025-09-01 — what date is exactly 3 months and 10 days later, and what day of the week does that land on?”
Business days countdown for payroll
“How many business days are there between 2025-07-15 and 2025-08-15 in Japan, excluding Japanese public holidays?”
Age or tenure in multiple units
“How many days, weeks, calendar months, and years are there between 1990-04-22 and 2025-04-22?”
Technical details
Endpoint
GEThttps://utils.kagurazaka.dev/v1/date?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need precise calendar arithmetic — adding or subtracting ISO 8601 durations with correct month-end clamping, or counting elapsed time between two dates in multiple units including country-specific business days. Prefer it over generic date libraries when you need business-day counting with public holidays for a specific country, or when you need ISO week numbers and weekday metadata alongside the result.
Side effects
- Missing required 'start' parameter returns an error
- Invalid date format (non-ISO 8601) causes a parse error
- Invalid ISO 8601 duration string (e.g. malformed 'P' expression) causes an error
- Unrecognized ISO country code may result in no holiday exclusions or an error
- Both 'add' and 'subtract' specified simultaneously may cause ambiguous behavior
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"start": {
"date": "2026-10-25",
"weekday": "Sunday",
"iso_week": 43
},
"between": {
"days": 61,
"months": 2,
"business_days": 42
}
}
}Tags
x402
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