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ISO Week Number Lookup
x402
ISO Week Number Lookup is a paid API for AI agents from datetime.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Returns the ISO 8601 week-numbering year, week number (1–53), and weekday (1=Monday…7=Sunday) for a given Gregorian calendar date.
Price / call$0.004
Success—
StatusUnknown
How this service works
Return the ISO-8601 week-numbering year, week number (1..53) and weekday (1=Monday..7=Sunday) for a Gregorian date. The ISO year can differ from the calendar year around New Year.
Output
Returns the ISO week-numbering year (which may differ from the Gregorian calendar year near New Year's), the ISO week number (1–53), and the ISO weekday number (1=Monday through 7=Sunday) for the supplied date.
Example use cases
Year-end payroll week assignment
“Our payroll system uses ISO week numbers — can you tell me which ISO week and ISO year December 31 2024 belongs to? I need to know if it's week 53 of 2024 or week 1 of 2025.”
Sprint planning date alignment
“We label our sprints by ISO week number. What ISO week number is January 6 2025, and is it a Monday? I need the weekday number too.”
Reporting period boundary check
“I need to confirm which ISO week number March 31 2026 falls in, and what day of the week it is — our quarterly reports are organized by ISO week.”
Technical details
Endpoint
POSThttps://datetime.openverbs.com/v1/iso-weekWhen to prefer
Use this endpoint when you specifically need ISO 8601 week-date components — especially around New Year when the ISO week-numbering year diverges from the Gregorian year. Prefer it over ordinal-day or weekday-only endpoints when you need all three ISO week-date fields (year, week, weekday) together in one call.
Side effects
- Invalid month value (e.g. 13) returns a validation error
- Day out of range for the given month returns an error
- Missing required field (year, month, or day) returns a 400-level error
- Non-integer or out-of-range year (outside 1–9999) rejected by schema
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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