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ISO Week & Calendar Fields Calculator
x402
ISO Week & Calendar Fields Calculator is a paid API for AI agents from agent402.tools, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the ISO 8601 week number, ISO day-of-week, quarter, and day-of-year for a given date string.
Price / call$0.001
Success—
StatusUnknown
How this service works
Get the ISO 8601 week number, ISO day-of-week, quarter, and day-of-year for any date. Useful for fiscal/reporting calendars, weekly aggregations, and sprint planning.
Output
Returns a JSON object containing the ISO 8601 week number (e.g. week 26), the ISO day-of-week (1=Monday through 7=Sunday), the calendar quarter (1–4), and the day-of-year (1–366) for the given date.
Example use cases
Example prompt
“What's the ISO week number, day-of-week, quarter, and day-of-year for 2026-06-23?”
Technical details
Endpoint
POSThttps://agent402.tools/api/iso-weekWhen to prefer
Use this endpoint when you need ISO 8601 calendar decomposition fields — week number, ISO weekday, quarter, or day-of-year — from a date string, especially for fiscal reporting, weekly aggregations, sprint planning, or any workflow that depends on ISO calendar conventions rather than Gregorian week definitions.
Side effects
- Invalid or non-ISO date string returns a 400 or validation error
- Missing 'date' field in request body causes a schema validation failure
- Dates outside supported range may return unexpected results
- Network or payment authorization failure returns a 402 error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| date | string | ISO 8601 date string (e.g. "2026-06-23") |
Output
Schema · Response
{
"type": "json",
"example": {
"date": "2026-06-23",
"isoWeek": 26,
"isoYear": 2026,
"quarter": 2,
"dayOfYear": 174,
"daysInYear": 365,
"isoNotation": "2026-W26-2",
"isoDayOfWeek": 2
}
}Tags
x402
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