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Life Dates & Milestones – Weekday of Date
x402
Life Dates & Milestones – Weekday of Date is a paid API for AI agents from life-dates.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Returns the day of the week, day of year, days left in year, quarter, and leap-year facts for any date from year 1000 onward.
Price / call$0.02
Success—
StatusUnknown
How this service works
Day of the week for any date from year 1000, with day of year, days left in the year, quarter and leap-year facts.
Output
Returns a JSON object with the full weekday name, whether the date is a weekend, the day-of-year number, days remaining in the year, the calendar quarter (1–4), leap-year status, month name, number of days in that month, Unix day offset, and Julian Day Number for the requested date.
Example use cases
Historical date weekday lookup
“What day of the week did World War II end — September 2, 1945 — and was it a weekend? Also tell me what day of the year that was.”
Year-end planning countdown
“For December 15, 2024, how many days are left in the year and what quarter is it in?”
Leap year and calendar fact check
“Was February 29, 2000 actually a valid date? Tell me if 2000 was a leap year and what weekday that day fell on.”
Technical details
Endpoint
GEThttps://life-dates.x402tookit.com/weekday-of-date?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative calendar metadata for a single date — especially the weekday, day-of-year, days remaining, or quarter — for any date back to year 1000. It is particularly well-suited for historical date lookups, calendar enrichment pipelines, or when leap-year and Julian Day Number data are needed alongside weekday information. Prefer sibling endpoints for age calculations, date differences, or birthday logic.
Side effects
- Missing 'date' query parameter returns a validation error
- Date string in wrong format (not YYYY-MM-DD) returns a parse error
- Date before year 1000 may return an out-of-range error
- Non-existent dates like February 30 return an invalid date error
- Network timeout results in no response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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