Julian Day

Convert a Gregorian calendar date/time to a Julian Day or vice versa.

All input dates are assumed to be in the Gregorian calendar. Even if you provide a date earlier than the first adoption of the Gregorian calendar, it is taken as is and is not assumed to be a Julian calendar date.

Calculate Julian Day

Returns the Julian Day for a given date

GEThttps://api.radiantdrift.com/julian-day/{date}

Authorization

radianDriftApiKeyradiantDriftJWT

Path parameters

date*any

The desired date/time in the Gregorian calendar.

Response

200

Body

application/json

query*object

response*object

Request

JavaScriptCurl

const response = await fetch('https://api.radiantdrift.com/julian-day/{date}', {
    method: 'GET',
    headers: {},
});
const data = await response.json();

Response

{
  "query": {
    "name": "julian-day",
    "date": "2024-10-15T22:00:00.000Z",
    "cost": 1
  },
  "response": {
    "julianDay": 2460599.41666667
  }
}

Calculate Gregorian Date/Time

Returns the date/time for a given Julian day

GEThttps://api.radiantdrift.com/date/{julian-day}

Authorization

radianDriftApiKeyradiantDriftJWT

Path parameters

julian-day*number

Julian day value.

Response

200

Body

application/json

query*object

response*object

Request

JavaScriptCurl

const response = await fetch('https://api.radiantdrift.com/date/{julian-day}', {
    method: 'GET',
    headers: {},
});
const data = await response.json();

Response

{
  "query": {
    "name": "date",
    "julianDay": 2460000,
    "cost": 1
  },
  "response": {
    "date": "2023-02-24T12:00:00.000Z"
  }
}