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Julian Date Converter
x402
Julian Date Converter is a paid API for AI agents from astro.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Converts a calendar date and time (year, month, day, hour, minute, second) to its Julian Date Number
Price / call$0.004
Success—
StatusUnknown
How this service works
Compute the astronomical Julian Date (JD, fractional, epoch noon 1 Jan 4713 BC) and Modified Julian Date (MJD = JD − 2400000.5) of a UTC instant. Unlike `calendar`'s integer Julian Day Number, this carries the time-of-day fraction.
Output
Returns the Julian Date (JD) — a continuous count of days since the beginning of the Julian Period (January 1, 4713 BC noon). The numeric value represents the precise point in time as a decimal day number, usable for astronomical calculations, time-interval arithmetic, or epoch comparisons.
Example use cases
Astronomical event timing calculation
“Calculate the Julian Date for the night of August 12, 2025 at 22:00 UTC — I need it for planning meteor shower observations.”
Historical date conversion for research
“What is the Julian Day Number for January 1, 1900 at midnight UTC? I need it to compute the time elapsed since a historical astronomical baseline.”
Epoch offset computation for software
“Convert December 31, 2000 at 12:00:00 UTC to a Julian Date Number so I can calculate offsets from the J2000.0 epoch in my orbital mechanics tool.”
Technical details
Endpoint
POSThttps://astro.openverbs.com/v1/julian-dateWhen to prefer
Choose this endpoint when you need a fast, authoritative conversion from a Gregorian calendar date-time to a Julian Date Number for astronomical, scientific, or historical time-interval computations. It is ideal for agents handling celestial event scheduling, orbital mechanics, or any domain where Julian Day Numbers are required as inputs to further calculations.
Side effects
- Invalid month value (outside 1–12) returns a validation error
- Invalid day value (outside 1–31) returns a validation error
- Year outside 1–9999 range is rejected
- Missing required fields (year, month, day) returns a 400-level error
- Payment failure via x402 prevents the call from completing
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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