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Julian Day Number to Gregorian Date Converter
x402
Julian Day Number to Gregorian Date Converter is a paid API for AI agents from datetime.openverbs.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-09-15).
Converts a Julian Day Number (JDN) to its proleptic-Gregorian calendar date, ISO weekday number (1=Monday..7=Sunday), and weekday name.
Price / call$0.004
Success—
StatusUnknown
How this service works
Convert a Julian Day Number back to a proleptic-Gregorian date, with the ISO weekday (1=Monday..7=Sunday) and its name.
Output
Returns the proleptic-Gregorian calendar date (year, month, day) corresponding to the given Julian Day Number, along with the ISO weekday number (1=Monday through 7=Sunday) and the full weekday name (e.g. 'Wednesday').
Example use cases
Decoding astronomical JDN timestamps
“I have an astronomical dataset that records events by Julian Day Number — can you convert JDN 2460310 to its Gregorian date and tell me what day of the week it falls on?”
Historical date reconstruction from JDN
“I found a Julian Day Number 2299161 in an old historical record. What is the corresponding proleptic-Gregorian date and weekday?”
Calendar system interoperability in software
“My application stores timestamps as Julian Day Numbers internally. Convert JDN 2440588 to its Gregorian date and ISO weekday so I can display it to users correctly.”
Technical details
Endpoint
POSThttps://datetime.openverbs.com/v1/from-jdnWhen to prefer
Use this endpoint when you have a Julian Day Number (JDN) — a continuous integer count of days since the Julian Period — and need to convert it back to a human-readable Gregorian date with weekday information. Prefer this over date arithmetic libraries when you need a reliable, stateless, pay-per-use API call without managing dependencies. This is the inverse of the companion Gregorian-to-JDN endpoint on the same service.
Side effects
- Missing required 'jdn' field returns a validation error
- Non-integer or float value for jdn may be rejected
- Extremely large or negative JDN values outside supported range may return an error
- Malformed request body returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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