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GET /v1/julian-day

Julian Day Number ↔ date

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10 free calls per day — no sign-up, no API key. Goes through the oanor gateway.

Custom headers (optional)
api.oanor.com/easter-api

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Code snippets

curl "https://api.oanor.com/easter-api/v1/julian-day" \
  -H "x-oanor-key: oanor_test_..."
await fetch("https://api.oanor.com/easter-api/v1/julian-day", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
$ch = curl_init("https://api.oanor.com/easter-api/v1/julian-day");
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$out = curl_exec($ch);
import requests
requests.get(
    "https://api.oanor.com/easter-api/v1/julian-day",
    headers={"x-oanor-key": "oanor_test_..."}
)

Example response

A real response from this endpoint, captured by the latest health check.

{
    "data": {
        "jdn": 2451545,
        "note": "Gregorian date → Julian Day Number, the continuous count of days since 1 January 4713 BC (Julian). Useful for date arithmetic across calendars.",
        "inputs": {
            "day": 1,
            "year": 2000,
            "month": 1
        },
        "weekday": "Saturday"
    },
    "meta": {
        "timestamp": "2026-06-05T19:50:21.805Z",
        "request_id": "715ba4cb-9002-4008-af76-90b473fe1553"
    },
    "status": "ok",
    "message": "Julian Day Number",
    "success": true
}