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Day of Year Calculator
x402
Day of Year 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 day number within the year (1-366), days remaining, leap-year status, percent of year complete, and week number for any given date.
Price / call$0.001
Success—
StatusUnknown
How this service works
Get the day number within the year (1-366) for any date, plus days remaining, leap-year status, percent of year complete, and a simple (Sunday-start) week number.
Output
Returns a JSON object with the day-of-year number (1–366), the number of days remaining in the year, whether the year is a leap year (boolean), the percentage of the year that has elapsed, and a simple Sunday-start week number.
Example use cases
Example prompt
“What day of the year is March 15, 2026 — like the ordinal day number — and how many days are left in the year after that?”
Technical details
Endpoint
POSThttps://agent402.tools/api/day-of-yearWhen to prefer
Use this endpoint when you need quick, structured calendar metadata about a specific date — particularly the ordinal day number, remaining days, leap year flag, year-completion percentage, or week number — without setting up a full date library or doing manual arithmetic.
Side effects
- Invalid or missing date string returns an error (e.g. non-ISO-8601 format)
- Dates outside supported range may return an error
- Malformed JSON body causes a 400 error
- Payment failure or insufficient funds returns a 402 response
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",
"dayOfYear": 174,
"daysInYear": 365,
"isLeapYear": false,
"weekNumber": 26,
"daysRemaining": 191,
"percentComplete": 47.7
}
}Tags
x402
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