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Day-of-Year Calculator
x402
Day-of-Year Calculator is a paid API for AI agents from datetime.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-14).
Returns the ordinal day of the year (1–366), total days in that year, and whether the year is a leap year for a given Gregorian date.
Price / call$0.004
Success—
StatusUnknown
How this service works
Return the ordinal day of the year (1..366), the number of days in that year and whether it is a leap year.
Output
Returns the ordinal day of the year (an integer from 1 to 366), the total number of days in that year (365 or 366), and a boolean indicating whether the year is a leap year.
Example use cases
Day-of-year for scientific logging
“I'm timestamping sensor readings by day-of-year — what ordinal day number is February 14, 2024, and does 2024 have 366 days?”
Leap year check for payroll system
“We're building a payroll calendar — is 2028 a leap year, and what is the ordinal day number for December 31, 2028?”
Progress-through-year tracking
“Tell me what day number of the year July 4, 2025 falls on so I can see how far through the year we are.”
Technical details
Endpoint
POSThttps://datetime.openverbs.com/v1/day-of-yearWhen to prefer
Use this endpoint when you need to convert a specific Gregorian calendar date into its ordinal day-of-year number, determine the total days in a year, or check for leap years — especially in date arithmetic, scientific logging, scheduling, or calendar display pipelines. Prefer over manual calculation when correctness for edge cases (leap years, century years) matters.
Side effects
- Invalid date values (e.g. month 13, day 32) return a validation error
- Year outside the range 1–9999 returns a schema validation error
- Missing required fields (year, month, or day) return a 400-level error
- Non-integer inputs for date components are rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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