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Work Time Calc – ISO Week Number & Sprint Lookup
x402
Work Time Calc – ISO Week Number & Sprint Lookup is a paid API for AI agents from work-time-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-21).
Returns the ISO 8601 week number and week-year for a given date, supports reverse lookup (week+weekYear to date range), and calculates sprint numbers relative to a configurable sprint start date.
Price / call$0.02
Success—
StatusUnknown
How this service works
ISO 8601 week number and week-year for a date (2021-01-03 is 2020-W53), reverse lookup and sprint numbering.
Output
Returns a JSON object containing the ISO week number (1–53), ISO week-year, whether the week-year differs from the calendar year, the Monday and Sunday bounding the week, the full ISO week date string, weekday number and name, day-of-year, total weeks in the week-year, and optionally sprint number, sprint start/end dates, day-of-sprint, and sprint length in days.
Example use cases
Year-end ISO week confusion check
“My reporting system shows 2020-W53 for January 3 2021 — can you confirm that's correct by looking up the ISO week number and week-year for 2021-01-03?”
Reverse-lookup sprint dates for planning
“Our sprints are 2 weeks long and sprint 1 started on 2024-01-08. What sprint number are we in today, and when does that sprint start and end?”
Find ISO week boundaries for payroll
“What are the Monday and Sunday dates for ISO week 14 of 2024? I need the exact start and end of that week for a payroll report.”
Technical details
Endpoint
GEThttps://work-time-calc.x402tookit.com/iso-week?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative ISO 8601 week numbering — especially around year boundaries where the week-year diverges from the calendar year (e.g. late December or early January). It is also the right choice for reverse lookup (week number + week-year to date range) and for calculating agile sprint numbers relative to a known sprint start date, all in a single call.
Side effects
- Missing both 'date' and 'weekYear'+'week' parameters returns an error indicating insufficient input
- Invalid date format (not YYYY-MM-DD) causes a parsing error
- Week number out of range (e.g. week 53 in a year with only 52 weeks) returns an error or null sprint fields
- sprintWeeks out of range (>8 or <1) may cause a validation error
- sprintStart date provided without a date parameter may return null sprint fields
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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